This is where the computer sim breaks down and doesn't show whats going on. The runner length and velocity make a HUGE difference in the torque output, especially below 4000rpm between the sbc and the good engine. DesktopDyno doesn't take that into account, it is kinda designed into the program to assume that variable is roughly the same as the sbc, which is why you get about the same numbers. The torque curve is considerably off what most Pontiac dyno tests look like, they are not 'peaky' engines, they have flat torque curves. The 242/252 cam needs more compression and airflow than the 260cfm of an unported E head. At that point you're also trying to make it run like a chevy, trade bottom end for top end, but the port design doesn't lend itself to that very well. As for cost, well you can find stuff for the Pontiac used as well . I got a set of unported E heads with new springs for $1700 not long ago, had a .030 over 400 block that I have about $600 in machine work done, boring and cleaning it essentially. The Pontiac doesn't need to be line bored/honed, decked, and most of the other things that are what shops do to the sbc just because most of them need it anyway. A $1500 crank kit, $200 cam, $100 lifters, $200in gaskets, and you have a 461 for right around $4k, and that 461 is going to stomp that sbc into the ground unless you spend a lot more on it than $3500 or so. remove the crank kit and just add some $300 forged rods and $550 forged pistons, and that is a dirt cheap 500hp engine.. that is making it not at 6500+, but at 5000ish. That means a lot more torque where you can use it. Sure you can get used parts for the sbc as well, but its quite rare to find used parts in decent condition, because they have been RPM'ed within an inch of their lifespan. Now if we want to talk about budget builds, using iron heads and inexpensive cams, even putting vortec heads on the sbc is going to cost a lot more than you will get from it, and a basic set of Pontiac heads are free to $300, pick your compression ratio. Using any other sbc head you are going to be into them for around $800 to $1200 for machine work just to get there to where the Pontiac is from the factory. People usually point at the cheapest chevy stuff like cast pistons and other low performance stuff, then say its cheaper than Pontiacs, when you start buying quality parts, they cost about the same for all of them. Go price some good forged pistons, you'll see what I mean. it costs the same to build a 350 as it does a 400 or 455, so if you have them all, go with the big one. Been doing this a while, and the chevy guys always spent a lot more than I did to go slower. Its all where you spend the money, and what you start with. Its seriously around $1500-$2000 to almost get the sbc to the point where the Pontiac is, if you go for 14 degree heads, or even 18 degree stuff, then its BIG $$$. Its already baked into every Pontiac after 1967, along with the 4 barrel heads having screw in studs, machined combustion chambers, a plate that controls camshaft endplay, air gap intakes, fully machined combustion chambers and gasket surfaces, and more. The thing is, its easy to find an sbc, look in just about any old taxi or delivery van. You can blow them up every week if you want, you're not out much since the junkyards are full of them. If you do the Pontiac right, the chevy will get rebuilt two or three times in the same lifespan as the Pontiac. I have engines I built 30 years ago that still run great, with factory rods even. They do not get pampered or driven nicely either. Have yet to meet a chevy guy who runs similar numbers and isn't refreshing his engine every other year. You get what you pay for, and quality parts cost money. When your engine starts off with quality parts, you don't have to spend as much to make it good. Its already there.
Pipemax is the Most advanced program used by Pros most of us not in the Pro cylinder head Porting business can afford it. There should be an option to custom configure cylinder head airflows all heads chosen from ..050" to .600 -.700" lifts. Also able to go to 1.000" full valve lifts for High End Race engines. 10 -13 airflow data entry points to for a graph flow curve. Comparison of Pontiac V8 and Chevy V8 will be fully valid. How I do it online for years now for others. I still use the Original Desktop Dyno 2001 and runs against the very latest except Pipemax Pro. Accurate to 1% of actual Engine water brake Dyno tests and Drag strip tests Pontiac V8 guys have done feedback later on. Also use include IVO, IVC, EVO, EVC at .050" or .020" lift or all simulations are not accurate. I show all in my engine simulations You Tube. Valid and True.
@@LSxHunter Its very important to form an accurate airflow chart for each head tested stock or modified. An accurate IVO, IVC EVO EVC. I like to do all tests with a single 4-bbl Carburetor. I know most guys want a Tunnel Ram they are really hard to predict accurate. Tests I posted one guy didn't like but it's the Truth. Took that down War ended silence
I agree with everything you said if someone was to build the 2 engines equal compression equal drive trains the pontiac is the winner I've owned a couple of pontiac 400ci top end is hard to find
The 400 Chevy only came with a 2 barrel carb for a reason. The great Smokey Yunick spent massive amounts of time and money researching how to make reliable power with this siamese cylinder engine, before abandoning it. A 4 barrel carb allows the engine to make too much heat. More horsepower means more heat at the top of the cylinder walls and in the cylinder head. When we raced them, the heads would crack at lap 6. Copper gaskets, more steam holes, wetting agent, 4 core radiator, giant fan, 3 groove water pump pully, high volume water pump. The head bolts are so close to the cylinders, you can see the thread distortion though the cylinder wall. Still lap 6. The cylinder walls distort from the uneven heating resulting in lost horsepower blowby. Steam bubbles form at the siamese hot spots, reducing cooling at that location. Raising the radiator pressure to 30 psi was no help. Straight water or antifreeze in any proportion was no help. A streetable 500 hp pontiac 400 is doable with aftermarket connecting rods. A streetable 500 hp 400 SBC is not.
Lol. I've owned around a dozen 400 sbc's in K5 blazers, and impalas, and every single one of them came from the factory with a quadrajet four barrel. There are , still to this day thousands of Chevy 400's on the road and track that don't have issues blowing up. You just don't now how to build a motor.
I have two 400s sitting here right now, both originally came with 4 barrel carbs. And among other things, you're also wrong about a 400 sbc being unable to make 500 streetable horsepower. They certainly are able.
Pontiac all the way. The 400 Chevy may be lighter than a 400 Pontiac. But if you put a 455 crank in a 400 You have a 455. Which is lighter than a 454 Chevy. It all comes down if you know what your doing. If you know what your doing you can build a Pontiac very cheap. Without using aftermarket heads.
Too bad the narrative is about 400-inch motors and not 455-inch motors and exotic crankshaft grinding. The big block Chevy weighs what 30 pounds more than a 455 Pontiac. And you can build a bb chevy for a lot less than a Pontiac 455 that would keep up with it. It must have been confusing for you the first couple of days when they moved you from picking in the orange grove to picking in the apple grove.
I will disagree. You left out the main factors for most car crafters. The SBC 400 has a siamesed block, making it very prone to overheating. It is also externally balanced, has a shorter deck height compared much taller deck height for the poncho, and one of the biggest downfalls for the 400 SBC are its’ short rods. All of these factors make it a nightmare to rev them high. Most opt to destroke them using the 350 cranks and 5.7 rods, creating a 377. While others use the 400 crank for the 350 creating a 383. But the 400 as it is… is a disaster, and the Poncho is the better engine to build and make power with.
5.7" rods in a 400 is a big improvement, and those pistons are readily available. But yea, the siamese cyls are an issue. The 125# increase in weight is also an issue for Pontiac. Pros-cons either way
400s don't have heating issues at all if u know how to fix a couple things. I don't agree with your ideas except the short connecting rods. I build my 400s for towing low rpm grunt idle to 4000rpm and don't care about high rpms, 400s SBs are one of the best built in the chevys.
@jessesyfie7244 People that claim Chevy 400's have heating issues are delusional. They do NOT have heating issues. Yes, they don't tolerate overheating as well as it's siblings, but the solution is easy. Just don't over heat them dummy..... lol
Bla bla bla. I've built a bunch of 400 sbc's and NEVER had an over heating problem. That myth comes from all the idiots back in the day removing the stock clutch fan and shroud to run one of those stupid flex fans. I have had HUGE overheating problems with a poncho 400. Not the coolant overheating, but the way the headers wrapped around the starter. You could stop to pump gas, let it heat soak for 5 minutes, and it would refuse to start unless you retarded the timing so far a prius would blow its doors off. As far as the Short rods go, just swap in 5.7 rods out of a 350 as you're buying pistons anyway. They are both great engines. You are just bringing up problems with the sbc that have been debunked thirty years ago.
For even a built street motor the cylinders and shorter rods are not a huge deal. Ive built two 400 chevs that lived happily seeing 6500rpm. An adequate cooling system is a must but you’d want that with any motor. Ive owned one pontiac 400 and loved that too but don’t see one as being any better than the other.
I have a Chevy 400 with Vortec heads in a G-Body and i enjoy it so much i took it to the drag strip and did a traction slipping 13.08 with a 4 speed shifting in it and a 4:10 rear gear on 8 inch wide tires.
Factory iron heads from the era the Pontiac runs circles around the Chevy. Neither iron head flows more than +- 200 cfm but the longer connecting rod, dwell time at TDC of the Pontiac wins.
Years ago I had a 73' Grand Am 400, 4 bbl, auto stock horsepower 230. The Grand Am moved ok for that year. My uncle Had a 1969 Firebird 350 H.O. that car hauled.
Car Craft did an article many years ago comparing similarly built 406 Chevy and Ford. They both had AFR heads and the same cam. They dynoed almost identically. They’re all air pumps.
Me 2 when u can buy a junk yard motor for around 500$ and it have 300 hp and u can spray it turbo it it's a no brainer!! But u got the dye hard Ford people that spend 6 k to 10 k and blow the block in haft and it just makes no sense keep your money I'm not mad if u put a chevy cheep motor to beat the piss out of I'm not talking car showes I'm talking beat slam gears and smile if it blows its 500 bucks !!
I run a 400sbc in my factory sbc '78 Formula and a 400p in my '77 TA. Both are super fun but that Pontiac will put you in the poor house real quick if you start trying to get cute with aftermarket stuff.
@@CJay-v6h no, the parts cost a small fortune. Look at a stroker kit for a Pontiac vs an SBC/BBC. Hell, just look at how much forged pistons and rods are.
@@superduty4556 just have to look at motor cost in general. I bought a 1970 formula WT 400 with #12 heads 2 years ago for $900 and I thought that was a lot but he claimed it was a ram air motor and I didn’t know my stuff. But I see engines going for 2,000$ now it’s crazy
Chevy 400 cause parts are cheaper, and ezer to get.air pump is engine most of us know get the are in and fuel and get it out faster makes more power😅, but there's no replacement for displacement
Running Pontiac 400 in my 79 Trans Am #12 heads no porting upgraded valve springs and roller tip rockers stock bottom end crower 60210 cam RPM intake Holly 750 vac secondaries 3:73:1 rear Turbo 400 with shift kit
Now compare both to the other Chevy “400” the big block Chevy 402. The BBC would destroy both of these motors. To quote Steve Brule of engine masters. “Nothing beats an LS engine, except a big block Chevy.”
@@LSxHunter I would not mind seeing a few other 400s as well, the Buick 400, Olds 403, both Chrysler and Ford also had 400 cubic inch engines as well. my money would be on the BBC for horsepower and average power. but the ford had a 4" stroke crank, and i bet it make more torque than any of the others.
The only reason that a 396/402 can possibly make more power than a Pontiac 400 is because Chevrolet always had veto power over Pontiac. Pontiac was never allowed to have such exotic parts like aluminum cylinder heads, roller cams or Holley carbs on factory engines. When Pontiac was trying implement the cylinder head technology gained from the 303CI Ram Air V (which the engine itself was admittedly a failure) GM suddenly pulled the plug. Guessing because Chevrolet was scared when they saw over 500HP dyno pulls when the heads without any refinement to adapt to the larger displacement engine. Then proof when someone dropped a 400CI with Ram Air V heads into a GTO and embarrassed the top of the line multi carburetor (banned by GM for all other divisions except Chevrolet) Corvette at their testing facility (Skunkworks?) Maybe Chevrolet was pissed Pontiac cribbed their high flow heads design from Ford? Or maybe even back in the 80s and 90s before aftermarket heads became more prevalent that the best flowing cylinder heads being cast for both small and big block Chevrolets were designed by Pontiac Motor Division? Chevrolet was only capable of making their engines the top dog of GM because GM protected Chevrolet from Pontiac. Had Pontiac been permitted by GM to adapt their Ram Air V cylinder head technology to production engines, the history of high performance during that time period would have been written much differently. On a final note the GM LS engines have quite a bit of traditional Pontiac V8 DNA.
I know Chevy are cheaper to build and the are nice motors they have a nice sound as well. I like big blocks none the less. However id here my older brother blocks away changing gears and id go running i was about 11 years old when I saw 1970 formula 400 4sp come up over the hill and it was the coolest site i have ever seen He let me take that car when i was only 16 with no licence no permit. I got same car later 72 formula 4sp and put a 455 in it from a 350 and it was a huge difference. My sister had a 69 GtO convertible 4sp which i almost got. I did get the engine she had the 78 trans am . i later got a 79 formula and an 81 trans am which could not get out of its own way but rode nice. Nothing was like my 72 and my brother 70 so to me its the most beaut-full shaped car before its time.
Sounds a bit like your family also suffers from a Pontiac addiction. There's just something special about the Pontiacs - even if it's the same power curve I got a feeling it'd still have a different feel.
The sbc 400 was like the small block with B.B. power in the small block line up ! Had one in my 46 Chevy coupe, it would almost pull the front wheels ! 👍🏻✌
Id say a good and much cheaper option for heads are the stock Pontiac heads, if you can find them. #12, #13, #16, #48 (RAIII), #62 (also RAIII), and several other options are excellent heads with smaller combustion chambers (72cc) that make higher compression numbers. 6x-4 are decent too, but low compression at 94cc, and 6x-8 are 101cc, with the 7.6:1 compression ratio which is awful. Some flathead pistons would raise that, but now we’re talking a rebuild and machine work. Personally, I have a 76 Grand Prix with the 400-4bbl, and I hope to find some Pontiac #16 heads, plus I already found a Performer RPM for $225. Havent decided on a cam yet, but Im thinking about one using Vizard’s formula. And hoping I dont discover the block needs a rebuild. Lol
The Pontiac is also not a big block like the 396/402/427 Chevy, FE or 460 Ford, 440 or Hemi Mopar, etc. It is pretty light for its physical size and displacement. Same for the 455 Buick and Olds blocks.
C'mon now. Ford's 400 had to be the worst out of the box. I can give it credit though, the square 4" bore/stroke can be a torque monster with some good aftermarket breathing devices 🌬
I can personally interject , one buddy in the late 90s had a stock 69 firebird with either a ram air ot a high output 400 , the other had a 68 camaro sbc 400 with 186 double humps and a mild but heavy cam 3.08 gears . Both ran well but that 400 sbc had ungodly torque down low the firebird rad really well but was gapped on many occasions by the Camaro.
Re: The "stock Pontiac 400 was gapped by a modified SBC 400 on many occasions" shouldn't surprise anyone among us. This really isn't an apples to apples comparison.
And the factory Q Jet manifold usually makes more power than any dual plane aftermarket intake, lol. Another case of trying to build a Pontiac like a Chevy.
I am painfully a Pontiac currently I have a 68 firebird with a 350 in it sitting in my yard I'm going to either build a 400 Pontiac or the 455, I know there are other options from Chevy which are cheaper.
Without even watching the video I can say hands down the Pontiac 400. The SBC in general was designed on the cheap with a list of poor engineering. In particular the SBC 400 was a flawed design trying to impersonate the Pontiac 400 but without sufficient space in the block for the bore. Chevy engineering attempted to cool the engine with steam holes. Every SBC 400 I ever knew came apart in a violent death at right around 100k miles, no more. Only Buick and AMC ever seemed to pick up on what Pontiac was doing with the 30 degree intake valve angle, and how that carried through engine design - cam, valve springs, etc. - at least those were the only other two to incorporate this into their designs. For pure engineering and design the Pontiac 400 was the far better choice.
Also the SBC was heavy for a small block, tied with Olds (which wasn't really a small block, it's the big block Olds with a lower deck height). An aluminum intake manifold on a Pontiac and it weighs just about as much as an SBC. The difference: Pontiac pioneered thin wall castings in the 1959 389, Chevy never adopted thin wall castings.
Complete FAIL! You're comparing bricks and potatoes. The geometry of the two engines is TOTALLY different. It's like saying a 400sbc and 402bbc are the same. Bore and stroke are, but rod length is .575" different. Go back to sleep and leave us alone
Nobody will agree with me, but I think Chrysler's 400 is the best. HUGE HUGE bore with a nice little short stroke. When built right they are an amazing little screamer. Lighter than Chevy and Ford big blocks too 👍
@buzzwaldron6195 Right on 👍 The geometry of the 403 is awesome too! It's a shame the 403 wasn't around in the pre-emissions days, it would've been an AWESOME little screamer 🔥🔥🔥
The biggest problem is that Pontiac hasnt produced a motor bigger than a 400 since 1978. They had a few left over for 4 speed Trans Ams in 1979. They produced the 400 sbc from 1970 till 1980. But all small block parts interchance. Well almost all, but with that kind of aftermarket support most go Chevrolet. Ive had three 400 SBC and two 400 Pontiac. If i could afford it, Pontiac all day. Love them!!
Pros and Cons . Pontiac is 125lbs heavier, Pontiac can handle 1,000 plus hp vs Chevys 750 hp. Pontiac has bigger valves 2.11 & flows 250 cfm vs Chevy 2.02 & flows 225 cfm. Pontiac can be stroked 4.50 with .0100 over bore netting 511 c.i.d. vs Chevy .060 over bore netting 383.. yes I favor Pontiac but you can't beat cheat price & availability of Chevy. I'd say Chevy wins this debate
Don't forget you can use big block pontiac heads off of a 427 or 455 etc.. you get instant horse power if you can find these heads stock the chevy heads have smaller valves and you can't use big block heads on the chevy 400.
There's no such thing as a "big block" or "small block" Pontiac, the blocks are all the same size. Without getting into Ram Air parts, the trick is to use small chamber 6X heads with a bit of porting if possible and if you have the budget, some oversize valves.
@1965l88 Everyone knows exactly what I meant in my statement. Technical terms that pontiac didn't use makes no difference. You can't use big chevy heads on a small block or vice versa. The point is pontiac heads are universal to their motors.
Hi, i am. Salutations to you. i am really love your videos. i am poked mine eye with a O.OO7" a few weeks ago and the whole left side of mine brain hurts now. FloTEK heads are very low performing compared to say even freedom series 185cc promaxx heads. Imagine a promaxx project X215cc head on the SBC400. And they are streetable efficiency even on a 355 to 383. Comparable to AFR. i bet they are 50 hp difference AT LEAST compared to any flotek head. So as long as you put the weirdest cam in the 400 sbc it shall perform under a pontiac 400.
Tuff decision.Both air pumps work great.Stroke,bore,heads.Not one is better then the other.Both great motors if built and tuned correctly and for what application.Can’t go wrong with either of them.The final say would how big is your wallet and what car do you own?
I personally prefer pontiac it's much easier using stock parts they picked everything that's advantage Chevy, but go back stock heads rods pistons. Dollar for dollar pontiac will smoke chevy.. I've got 3 track championships and 57 wins on dirt track that proves it. Every race I won was slap full of hard core chevy guys.. oh, all mad as hornets too ! Jumping up and down protesting knowing they have a chevy the magazines and now internet says is WAY better than pontiac boat anchor AHAHAHAHAHAHHAAHAÀ
Most dyno tests I have seen show the Pontiac Q Jet intake and carb set up is very hard to beat, at least until you get to aftermarket CNC ported heads, a monster cam where you need a single plane manifold and a carb up near dominator sizing.
@@RMAGEDN740 Just remember some information on engine swaps that was readily available back in the '70s and '80s. Showed the 215 aluminum Buick and Olds V8s as the lightest, followed by SBCs and SBFs, whichever was actually lighter dependent upon trim accessories. Windsors and Clevelands a bit heavier, then you get into the mid-weight engines. The Buick, Olds small and big blocks, Pontiacs, Cadillacs and AMC engines, 340/360 Mopars, then the behemoths, BBC, Ford FE and 429/460, 440s and Hemis, and the 430/461 Lincoln engines. Lengths were all pretty much determined by available space in engine bays designed to carry I6 engines. Width determined by deck height, size of the heads, and exhaust location.
I'd go for the Pontiac 400. Use could use ported & polished 326 or 350 heads and Pontiac will be the king of torque and be unique on the street because you can just use a factory intake & carb for everyday drivablity just tooling around on the two barrels of the Q jet until you open it up and it does have to rev up because all your power will be in before 5500 rpm anyway!
I was the first with the like :) thanks again, and I would run ( and I have) the 305 tpi. Because everyone is complaining about the " small" engine that is weak. But I'm sure it isn't
@@mikee2923 it can be really strong if you do some work with it. If you want a drag car displacement is important if you want a track car small light engines works the best... With the first TPI intake
You hear abt sbc 400 builds every day for racing , street fun etc, you dont hear sh!t abt no 400 pontiac, the only Pontiac i would put money in would be the 389, other than that SBC 400 hands down
Does the Chevy 400 have water jacket. Coolant issues? I'm not a Mechanic. trying to decide for my choice of motor for my build. I've heard about this issue with the 400 Chevy. I love Pontiac motors. But to build them, you're going have to give you're right and left nut to build them! LOL!
The standard 400SBC does have cooling issues between the middle 2 cylinders due to the siamesed cylinders. It’s been said that there are DIY methods to drill out the steamholes to alleviate the issue. I’m currently on the hunt for a 400SBC for further testing
I have run 400 sbc motors in my race cars my street cars and my trucks for 40 years and as long as you have a big enough radiator you shouldn't have any issues. The people that say the 400 has cooling issues are the ones that have a plugged-up radiator and or clutch fan issue. You can drill the steam holes into heads that don't have them as long as you watch how it's done on TH-cam before you do it.
That's not true. In dirt track racing the 400 has been the go-to block when rules alow them for nearly 50 years. In hot rods, yes you're mostly right. Although if you aren't retarded and can keep your ride from overheating, there's nothing wrong with building a 400. Go with 5.7" rods though.
This is where the computer sim breaks down and doesn't show whats going on. The runner length and velocity make a HUGE difference in the torque output, especially below 4000rpm between the sbc and the good engine. DesktopDyno doesn't take that into account, it is kinda designed into the program to assume that variable is roughly the same as the sbc, which is why you get about the same numbers. The torque curve is considerably off what most Pontiac dyno tests look like, they are not 'peaky' engines, they have flat torque curves. The 242/252 cam needs more compression and airflow than the 260cfm of an unported E head. At that point you're also trying to make it run like a chevy, trade bottom end for top end, but the port design doesn't lend itself to that very well.
As for cost, well you can find stuff for the Pontiac used as well . I got a set of unported E heads with new springs for $1700 not long ago, had a .030 over 400 block that I have about $600 in machine work done, boring and cleaning it essentially. The Pontiac doesn't need to be line bored/honed, decked, and most of the other things that are what shops do to the sbc just because most of them need it anyway. A $1500 crank kit, $200 cam, $100 lifters, $200in gaskets, and you have a 461 for right around $4k, and that 461 is going to stomp that sbc into the ground unless you spend a lot more on it than $3500 or so. remove the crank kit and just add some $300 forged rods and $550 forged pistons, and that is a dirt cheap 500hp engine.. that is making it not at 6500+, but at 5000ish. That means a lot more torque where you can use it.
Sure you can get used parts for the sbc as well, but its quite rare to find used parts in decent condition, because they have been RPM'ed within an inch of their lifespan.
Now if we want to talk about budget builds, using iron heads and inexpensive cams, even putting vortec heads on the sbc is going to cost a lot more than you will get from it, and a basic set of Pontiac heads are free to $300, pick your compression ratio. Using any other sbc head you are going to be into them for around $800 to $1200 for machine work just to get there to where the Pontiac is from the factory.
People usually point at the cheapest chevy stuff like cast pistons and other low performance stuff, then say its cheaper than Pontiacs, when you start buying quality parts, they cost about the same for all of them. Go price some good forged pistons, you'll see what I mean. it costs the same to build a 350 as it does a 400 or 455, so if you have them all, go with the big one.
Been doing this a while, and the chevy guys always spent a lot more than I did to go slower. Its all where you spend the money, and what you start with. Its seriously around $1500-$2000 to almost get the sbc to the point where the Pontiac is, if you go for 14 degree heads, or even 18 degree stuff, then its BIG $$$. Its already baked into every Pontiac after 1967, along with the 4 barrel heads having screw in studs, machined combustion chambers, a plate that controls camshaft endplay, air gap intakes, fully machined combustion chambers and gasket surfaces, and more.
The thing is, its easy to find an sbc, look in just about any old taxi or delivery van. You can blow them up every week if you want, you're not out much since the junkyards are full of them. If you do the Pontiac right, the chevy will get rebuilt two or three times in the same lifespan as the Pontiac. I have engines I built 30 years ago that still run great, with factory rods even. They do not get pampered or driven nicely either. Have yet to meet a chevy guy who runs similar numbers and isn't refreshing his engine every other year.
You get what you pay for, and quality parts cost money. When your engine starts off with quality parts, you don't have to spend as much to make it good. Its already there.
Pipemax is the Most advanced program used by Pros most of us not in the Pro cylinder head Porting business can afford it.
There should be an option to custom configure cylinder head airflows all heads chosen from ..050" to .600 -.700" lifts. Also able to go to 1.000" full valve lifts for High End Race engines. 10 -13 airflow data entry points to for a graph flow curve.
Comparison of Pontiac V8 and Chevy V8 will be fully valid. How I do it online for years now for others.
I still use the Original Desktop Dyno 2001 and runs against the very latest except Pipemax Pro.
Accurate to 1% of actual Engine water brake Dyno tests and Drag strip tests Pontiac V8 guys have done feedback later on.
Also use include IVO, IVC, EVO, EVC at .050" or .020" lift or all simulations are not accurate.
I show all in my engine simulations You Tube. Valid and True.
I settled on Engine Analyzer Pro. You’re able to get really detailed with velocities, radiuses and all the nitty gritty.
@@LSxHunter Its very important to form an accurate airflow chart for each head tested stock or modified.
An accurate IVO, IVC EVO EVC. I like to do all tests with a single 4-bbl Carburetor. I know most guys want a Tunnel Ram they are really hard to predict accurate. Tests I posted one guy didn't like but it's the Truth.
Took that down War ended silence
@@LSxHunter Single 4-bbl setup is not affected by G-forces hard Launch or on hard turns also.
I agree with everything you said if someone was to build the 2 engines equal compression equal drive trains the pontiac is the winner I've owned a couple of pontiac 400ci top end is hard to find
I own 3x400 SBC they cheaper to build, but Pontiac engines are masterpiece
It's true. I'm honestly debating on restoring a Pontiac engine specifically for a coffee table.
@@LSxHunter😂😂
The 400 Chevy only came with a 2 barrel carb for a reason. The great Smokey Yunick spent massive amounts of time and money researching how to make reliable power with this siamese cylinder engine, before abandoning it.
A 4 barrel carb allows the engine to make too much heat.
More horsepower means more heat at the top of the cylinder walls and in the cylinder head. When we raced them, the heads would crack at lap 6. Copper gaskets, more steam holes, wetting agent, 4 core radiator, giant fan, 3 groove water pump pully, high volume water pump. The head bolts are so close to the cylinders, you can see the thread distortion though the cylinder wall. Still lap 6. The cylinder walls distort from the uneven heating resulting in lost horsepower blowby. Steam bubbles form at the siamese hot spots, reducing cooling at that location. Raising the radiator pressure to 30 psi was no help. Straight water or antifreeze in any proportion was no help.
A streetable 500 hp pontiac 400 is doable with aftermarket connecting rods. A streetable 500 hp 400 SBC is not.
Lol. I've owned around a dozen 400 sbc's in K5 blazers, and impalas, and every single one of them came from the factory with a quadrajet four barrel. There are , still to this day thousands of Chevy 400's on the road and track that don't have issues blowing up. You just don't now how to build a motor.
@bdd1469 Funny how he claims "400" heads crack easily, when they are the same exact heads as a 350 used, but with the addition of 6 steam holes.......
I have two 400s sitting here right now, both originally came with 4 barrel carbs. And among other things, you're also wrong about a 400 sbc being unable to make 500 streetable horsepower. They certainly are able.
And those heads he listed for teh SBC are some huge ports. What is the comparison using the same series Edelbrock heads?
Pontiac all the way. The 400 Chevy may be lighter than a 400 Pontiac. But if you put a 455 crank in a 400 You have a 455. Which is lighter than a 454 Chevy. It all comes down if you know what your doing. If you know what your doing you can build a Pontiac very cheap. Without using aftermarket heads.
How are you putting a 455 crank in a 400, when a 455 uses larger main journals?
Mill the journals - fairly common practice in the old days
@@LSxHunter do you mean, turn down the journals on the crank?
@@Trendyrapslut yeah. That word sounds significantly more correct 😂
Too bad the narrative is about 400-inch motors and not 455-inch motors and exotic crankshaft grinding. The big block Chevy weighs what 30 pounds more than a 455 Pontiac. And you can build a bb chevy for a lot less than a Pontiac 455 that would keep up with it. It must have been confusing for you the first couple of days when they moved you from picking in the orange grove to picking in the apple grove.
Cool. I have the Pontiac 400 in my LeMans. Great to learn more about it.
I will disagree. You left out the main factors for most car crafters. The SBC 400 has a siamesed block, making it very prone to overheating. It is also externally balanced, has a shorter deck height compared much taller deck height for the poncho, and one of the biggest downfalls for the 400 SBC are its’ short rods. All of these factors make it a nightmare to rev them high. Most opt to destroke them using the 350 cranks and 5.7 rods, creating a 377. While others use the 400 crank for the 350 creating a 383. But the 400 as it is… is a disaster, and the Poncho is the better engine to build and make power with.
5.7" rods in a 400 is a big improvement, and those pistons are readily available. But yea, the siamese cyls are an issue. The 125# increase in weight is also an issue for Pontiac. Pros-cons either way
400s don't have heating issues at all if u know how to fix a couple things. I don't agree with your ideas except the short connecting rods. I build my 400s for towing low rpm grunt idle to 4000rpm and don't care about high rpms, 400s SBs are one of the best built in the chevys.
@jessesyfie7244 People that claim Chevy 400's have heating issues are delusional. They do NOT have heating issues. Yes, they don't tolerate overheating as well as it's siblings, but the solution is easy. Just don't over heat them dummy..... lol
Bla bla bla. I've built a bunch of 400 sbc's and NEVER had an over heating problem. That myth comes from all the idiots back in the day removing the stock clutch fan and shroud to run one of those stupid flex fans. I have had HUGE overheating problems with a poncho 400. Not the coolant overheating, but the way the headers wrapped around the starter. You could stop to pump gas, let it heat soak for 5 minutes, and it would refuse to start unless you retarded the timing so far a prius would blow its doors off. As far as the Short rods go, just swap in 5.7 rods out of a 350 as you're buying pistons anyway. They are both great engines. You are just bringing up problems with the sbc that have been debunked thirty years ago.
For even a built street motor the cylinders and shorter rods are not a huge deal. Ive built two 400 chevs that lived happily seeing 6500rpm. An adequate cooling system is a must but you’d want that with any motor. Ive owned one pontiac 400 and loved that too but don’t see one as being any better than the other.
I have a Chevy 400 with Vortec heads in a G-Body and i enjoy it so much i took it to the drag strip and did a traction slipping 13.08 with a 4 speed shifting in it and a 4:10 rear gear on 8 inch wide tires.
Factory iron heads from the era the Pontiac runs circles around the Chevy. Neither iron head flows more than +- 200 cfm but the longer connecting rod, dwell time at TDC of the Pontiac wins.
The Pontiac 428 has been referred to as the, "Perfect Pontiac", in the '90's articles. Really climbs the revs fast and lots of torque.
428 is hands down my favorite Pontiac engine. It does so many things so well!
@@LSxHunter have you done a show on the 428? If so please send me the link.
@@kevinmanning4880 Not yet but it's on my list. We'll be taking a look at the 428 in a street rod application.
@@LSxHunter looking forward to it! Much appreciate your in depth findings and conclusions on your videos. Really relate to your word.
Bore and stroke with the runner volumetric. Makes the best harmony.
Years ago I had a 73' Grand Am 400, 4 bbl, auto stock horsepower 230. The Grand Am moved ok for that year. My uncle Had a 1969 Firebird 350 H.O. that car hauled.
I’d fight a grizzly for a 73 Grand Am nowadays. Those first gen fbodies are WAY smaller than you’d think!
Car Craft did an article many years ago comparing similarly built 406 Chevy and Ford. They both had AFR heads and the same cam. They dynoed almost identically. They’re all air pumps.
You’d be shocked at the amount of people who argue otherwise. I’m just here to move air as cheaply as possible and making some tire smoke 🤷♂️
Me 2 when u can buy a junk yard motor for around 500$ and it have 300 hp and u can spray it turbo it it's a no brainer!! But u got the dye hard Ford people that spend 6 k to 10 k and blow the block in haft and it just makes no sense keep your money I'm not mad if u put a chevy cheep motor to beat the piss out of I'm not talking car showes I'm talking beat slam gears and smile if it blows its 500 bucks !!
Right.
The engine doesn't know it's name on the valve covers,and it doesn't care 😅
Air pumps aren’t compressing fuel and air together.
I run a 400sbc in my factory sbc '78 Formula and a 400p in my '77 TA. Both are super fun but that Pontiac will put you in the poor house real quick if you start trying to get cute with aftermarket stuff.
Yes it will. I wanna build another Pontiac motor for my 55 poncho but it’s just so much damn money for what I wanna do
@@CJay-v6h no, the parts cost a small fortune. Look at a stroker kit for a Pontiac vs an SBC/BBC.
Hell, just look at how much forged pistons and rods are.
@@superduty4556 just have to look at motor cost in general. I bought a 1970 formula WT 400 with #12 heads 2 years ago for $900 and I thought that was a lot but he claimed it was a ram air motor and I didn’t know my stuff. But I see engines going for 2,000$ now it’s crazy
@@Ox78 true, I've been buying up 350s when I see them because they're probably next to shoot up.
Chevy 400 cause parts are cheaper, and ezer to get.air pump is engine most of us know get the are in and fuel and get it out faster makes more power😅, but there's no replacement for displacement
Running Pontiac 400 in my 79 Trans Am #12 heads no porting upgraded valve springs and roller tip rockers stock bottom end crower 60210 cam RPM intake Holly 750 vac secondaries 3:73:1 rear Turbo 400 with shift kit
Now compare both to the other Chevy “400” the big block Chevy 402. The BBC would destroy both of these motors. To quote Steve Brule of engine masters. “Nothing beats an LS engine, except a big block Chevy.”
Honestly. I can dig it.
@@LSxHunter I would not mind seeing a few other 400s as well, the Buick 400, Olds 403, both Chrysler and Ford also had 400 cubic inch engines as well. my money would be on the BBC for horsepower and average power. but the ford had a 4" stroke crank, and i bet it make more torque than any of the others.
The only reason that a 396/402 can possibly make more power than a Pontiac 400 is because Chevrolet always had veto power over Pontiac. Pontiac was never allowed to have such exotic parts like aluminum cylinder heads, roller cams or Holley carbs on factory engines. When Pontiac was trying implement the cylinder head technology gained from the 303CI Ram Air V (which the engine itself was admittedly a failure) GM suddenly pulled the plug. Guessing because Chevrolet was scared when they saw over 500HP dyno pulls when the heads without any refinement to adapt to the larger displacement engine. Then proof when someone dropped a 400CI with Ram Air V heads into a GTO and embarrassed the top of the line multi carburetor (banned by GM for all other divisions except Chevrolet) Corvette at their testing facility (Skunkworks?) Maybe Chevrolet was pissed Pontiac cribbed their high flow heads design from Ford? Or maybe even back in the 80s and 90s before aftermarket heads became more prevalent that the best flowing cylinder heads being cast for both small and big block Chevrolets were designed by Pontiac Motor Division? Chevrolet was only capable of making their engines the top dog of GM because GM protected Chevrolet from Pontiac. Had Pontiac been permitted by GM to adapt their Ram Air V cylinder head technology to production engines, the history of high performance during that time period would have been written much differently. On a final note the GM LS engines have quite a bit of traditional Pontiac V8 DNA.
Completely true, other than the weight difference.
Pontiac 400 vs Chevy 396 is a better comparison.
I would take the Pontiac all day and twice on Sunday.
@0:18 A factory SBC 400 has a standard bore diameter of 4.125", not 4.120".
Balanced Pontiac 400 +030 JB hyper pistons with 0 deck hight block, ceramic coated hooker headers, Edelbrock duel plain intake, Edelbrock 750cfm carb, ported 6x #8 heads with larger intake valves, Compcams XE 268 cam.
1973 Formula clone, Supra W57 5 speed manual transmission, 3.42 posi diff.
I know Chevy are cheaper to build and the are nice motors they have a nice sound as well. I like big blocks none the less. However id here my older brother blocks away changing gears and id go running i was about 11 years old when I saw 1970 formula 400 4sp come up over the hill and it was the coolest site i have ever seen He let me take that car when i was only 16 with no licence no permit. I got same car later 72 formula 4sp and put a 455 in it from a 350 and it was a huge difference. My sister had a 69
GtO convertible 4sp which i almost got. I did get the engine she had the 78 trans am . i later got a 79 formula and an 81 trans am which could not get out of its own way but rode nice. Nothing was like my 72 and my brother 70 so to me its the most beaut-full shaped car before its time.
Sounds a bit like your family also suffers from a Pontiac addiction. There's just something special about the Pontiacs - even if it's the same power curve I got a feeling it'd still have a different feel.
The sbc 400 was like the small block with B.B. power in the small block line up ! Had one in my 46 Chevy coupe, it would almost pull the front wheels ! 👍🏻✌
I have 7 sbc 400s and 3 of them currently running in cars.Love them for cheap power.Absolutely true video.None cracked.
Id say a good and much cheaper option for heads are the stock Pontiac heads, if you can find them. #12, #13, #16, #48 (RAIII), #62 (also RAIII), and several other options are excellent heads with smaller combustion chambers (72cc) that make higher compression numbers. 6x-4 are decent too, but low compression at 94cc, and 6x-8 are 101cc, with the 7.6:1 compression ratio which is awful. Some flathead pistons would raise that, but now we’re talking a rebuild and machine work.
Personally, I have a 76 Grand Prix with the 400-4bbl, and I hope to find some Pontiac #16 heads, plus I already found a Performer RPM for $225. Havent decided on a cam yet, but Im thinking about one using Vizard’s formula. And hoping I dont discover the block needs a rebuild. Lol
@LSxHunter Can you do a comparison between the 455 Buick and the 500 Cadillac?
Chevy bore 4.125 Pontiac had 4 inch stroke and 4 inch bore. Pontiac was a muscle car motor Chevy was not.
The 421 was a 4.093x4. The 400 used a 4.12
@@LSxHunter 428 was the same bore as the 400 and shared the same heads. 428 can cheat on compression easier than a 455.
The Pontiac is also not a big block like the 396/402/427 Chevy, FE or 460 Ford, 440 or Hemi Mopar, etc. It is pretty light for its physical size and displacement. Same for the 455 Buick and Olds blocks.
I had no idea they made that much power.
Ford and pontiac always and will forever be better than Chevy 😮💨
C'mon now. Ford's 400 had to be the worst out of the box. I can give it credit though, the square 4" bore/stroke can be a torque monster with some good aftermarket breathing devices 🌬
@@johneckert1365 yeah true but I’ve always just had super good luck with ford engines 🤣 but I mean I see your point tho
@@johneckert1365probably so . The 351 Cleveland was the bad boy .
I can personally interject , one buddy in the late 90s had a stock 69 firebird with either a ram air ot a high output 400 , the other had a 68 camaro sbc 400 with 186 double humps and a mild but heavy cam 3.08 gears . Both ran well but that 400 sbc had ungodly torque down low the firebird rad really well but was gapped on many occasions by the Camaro.
Re: The "stock Pontiac 400 was gapped by a modified SBC 400 on many occasions" shouldn't surprise anyone among us.
This really isn't an apples to apples comparison.
i currently run a small block 400 it has nice torque and runs wel in my 55 belair
I had a Pontiac 350 bored and stroked to 413 with a kit from Butler Performance and it was a torque MONSTER
This piques my interest heavily.
@@LSxHunterI've always been curious about a Pontiac 350 build, please do it.🤔🤪
Lol, all Pontiac engines have had a factory "Air Gap" intake manifold since 1955.
I caught that too...
1916 Chevy V8 had air gap intake manifold...
And the factory Q Jet manifold usually makes more power than any dual plane aftermarket intake, lol. Another case of trying to build a Pontiac like a Chevy.
Why waste time or money on any small block? Unless you have too of course.
I am painfully a Pontiac currently I have a 68 firebird with a 350 in it sitting in my yard I'm going to either build a 400 Pontiac or the 455, I know there are other options from Chevy which are cheaper.
Without even watching the video I can say hands down the Pontiac 400. The SBC in general was designed on the cheap with a list of poor engineering. In particular the SBC 400 was a flawed design trying to impersonate the Pontiac 400 but without sufficient space in the block for the bore. Chevy engineering attempted to cool the engine with steam holes. Every SBC 400 I ever knew came apart in a violent death at right around 100k miles, no more. Only Buick and AMC ever seemed to pick up on what Pontiac was doing with the 30 degree intake valve angle, and how that carried through engine design - cam, valve springs, etc. - at least those were the only other two to incorporate this into their designs. For pure engineering and design the Pontiac 400 was the far better choice.
Also the SBC was heavy for a small block, tied with Olds (which wasn't really a small block, it's the big block Olds with a lower deck height). An aluminum intake manifold on a Pontiac and it weighs just about as much as an SBC. The difference: Pontiac pioneered thin wall castings in the 1959 389, Chevy never adopted thin wall castings.
Complete FAIL! You're comparing bricks and potatoes. The geometry of the two engines is TOTALLY different. It's like saying a 400sbc and 402bbc are the same. Bore and stroke are, but rod length is .575" different. Go back to sleep and leave us alone
…that’s the entire idea.
Nobody will agree with me, but I think Chrysler's 400 is the best. HUGE HUGE bore with a nice little short stroke. When built right they are an amazing little screamer. Lighter than Chevy and Ford big blocks too 👍
4.342" bore
3.375" stroke
Like an Olds 403"...
@buzzwaldron6195 Right on 👍 The geometry of the 403 is awesome too! It's a shame the 403 wasn't around in the pre-emissions days, it would've been an AWESOME little screamer 🔥🔥🔥
The 361/383/400 block is right there with the Pontiac, Buick and Olds engines in the 400-455 range.
Pancho please
I love the Pontiacs torque in all there motors
And it rolls in down low in a street engine.
you should do the comparison with good factory heads ,on similiar builds you might change your opinion???
I’m a big believer in the Pontiac heads - Chevy heads didn’t get really good until Vortec heads - but those were a massive leap
Vs Buick 400?
I’d love to but I’m not overly knowledgeable on those engines.
The biggest problem is that Pontiac hasnt produced a motor bigger than a 400 since 1978. They had a few left over for 4 speed Trans Ams in 1979. They produced the 400 sbc from 1970 till 1980. But all small block parts interchance. Well almost all, but with that kind of aftermarket support most go Chevrolet. Ive had three 400 SBC and two 400 Pontiac. If i could afford it, Pontiac all day. Love them!!
Pros and Cons . Pontiac is 125lbs heavier, Pontiac can handle 1,000 plus hp vs Chevys 750 hp. Pontiac has bigger valves 2.11 & flows 250 cfm vs Chevy 2.02 & flows 225 cfm. Pontiac can be stroked 4.50 with .0100 over bore netting 511 c.i.d. vs Chevy .060 over bore netting 383.. yes I favor Pontiac but you can't beat cheat price & availability of Chevy. I'd say Chevy wins this debate
Both engines would greatly benefit from 110 degree LSA. Especially the Pontiac down low.
I sold my old Pontiac partly because I could never afford lighten that extremely hot and heavy hunk of cast iron under the hood ! Miss it tho .
The SBC 400. Definitely! Just based on the results & cost savings.
The Chevrolet engine is actually 401 cubic inches.
Don't forget you can use big block pontiac heads off of a 427 or 455 etc.. you get instant horse power if you can find these heads stock the chevy heads have smaller valves and you can't use big block heads on the chevy 400.
There's no such thing as a "big block" or "small block" Pontiac, the blocks are all the same size. Without getting into Ram Air parts, the trick is to use small chamber 6X heads with a bit of porting if possible and if you have the budget, some oversize valves.
@1965l88 Everyone knows exactly what I meant in my statement. Technical terms that pontiac didn't use makes no difference. You can't use big chevy heads on a small block or vice versa. The point is pontiac heads are universal to their motors.
Hi, i am. Salutations to you. i am really love your videos. i am poked mine eye with a O.OO7" a few weeks ago and the whole left side of mine brain hurts now. FloTEK heads are very low performing compared to say even freedom series 185cc promaxx heads. Imagine a promaxx project X215cc head on the SBC400. And they are streetable efficiency even on a 355 to 383. Comparable to AFR. i bet they are 50 hp difference AT LEAST compared to any flotek head. So as long as you put the weirdest cam in the 400 sbc it shall perform under a pontiac 400.
447cu(389) speedmaster heads, howards 290/296 560/565 , 108 roller, torquer 2 intake. Better block than the 400 Chevy Siamese cylinder
Yes, stronger and more potential. But heavier.
@@johneckert1365 yep, around 40 pounds stock, dropped more than that with aluminum heads.
Great video.Always wanted to see a comparison of the two engines.
I would take either engine to drive and Race with.
Tuff decision.Both air pumps work great.Stroke,bore,heads.Not one is better then the other.Both great motors if built and tuned correctly and for what application.Can’t go wrong with either of them.The final say would how big is your wallet and what car do you own?
I personally prefer pontiac it's much easier using stock parts they picked everything that's advantage Chevy, but go back stock heads rods pistons.
Dollar for dollar pontiac will smoke chevy.. I've got 3 track championships and 57 wins on dirt track that proves it.
Every race I won was slap full of hard core chevy guys.. oh, all mad as hornets too ! Jumping up and down protesting knowing they have a chevy the magazines and now internet says is WAY better than pontiac boat anchor
AHAHAHAHAHAHHAAHAÀ
Most dyno tests I have seen show the Pontiac Q Jet intake and carb set up is very hard to beat, at least until you get to aftermarket CNC ported heads, a monster cam where you need a single plane manifold and a carb up near dominator sizing.
I remember reading that you can take a stock (some) pontiac v8 all the way out to 464ci.
The Chrysler 400 to 499 CID
Butler Racing does the Pontiac engines out to 500+ cubes.
@@timclaus8313 original block dimensions?
@@RMAGEDN740 Just remember some information on engine swaps that was readily available back in the '70s and '80s. Showed the 215 aluminum Buick and Olds V8s as the lightest, followed by SBCs and SBFs, whichever was actually lighter dependent upon trim accessories. Windsors and Clevelands a bit heavier, then you get into the mid-weight engines. The Buick, Olds small and big blocks, Pontiacs, Cadillacs and AMC engines, 340/360 Mopars, then the behemoths, BBC, Ford FE and 429/460, 440s and Hemis, and the 430/461 Lincoln engines. Lengths were all pretty much determined by available space in engine bays designed to carry I6 engines. Width determined by deck height, size of the heads, and exhaust location.
I'd go for the Pontiac 400. Use could use ported & polished 326 or 350 heads and Pontiac will be the king of torque and be unique on the street because you can just use a factory intake & carb for everyday drivablity just tooling around on the two barrels of the Q jet until you open it up and it does have to rev up because all your power will be in before 5500 rpm anyway!
Sounds like me after an 18 pack
There’s a strong chance whiskey was involved in filming most of these non-shop videos 😂
I was the first with the like :) thanks again, and I would run ( and I have) the 305 tpi. Because everyone is complaining about the " small" engine that is weak. But I'm sure it isn't
Appreciate you!
GM’s TPI set up gave the SBC what it has always lacked, low end torque.
I've seen plenty of 305ci that would rock and roll
@@mikee2923 it can be really strong if you do some work with it. If you want a drag car displacement is important if you want a track car small light engines works the best... With the first TPI intake
One a small other big block of comparison
Yes - one is a small block. Pontiacs are not designated via small block or big block. They share the same external dimensions from the 326-455.
You hear abt sbc 400 builds every day for racing , street fun etc, you dont hear sh!t abt no 400 pontiac, the only Pontiac i would put money in would be the 389, other than that SBC 400 hands down
the poncho 400 is a 060" over 389 with bigger, straighter valves, and a better intake
@@kellynestegard5208 Improved heads too.
Does the Chevy 400 have water jacket. Coolant issues? I'm not a Mechanic. trying to decide for my choice of motor for my build. I've heard about this issue with the 400 Chevy. I love Pontiac motors. But to build them, you're going have to give you're right and left nut to build them! LOL!
The standard 400SBC does have cooling issues between the middle 2 cylinders due to the siamesed cylinders. It’s been said that there are DIY methods to drill out the steamholes to alleviate the issue. I’m currently on the hunt for a 400SBC for further testing
I have run 400 sbc motors in my race cars my street cars and my trucks for 40 years and as long as you have a big enough radiator you shouldn't have any issues. The people that say the 400 has cooling issues are the ones that have a plugged-up radiator and or clutch fan issue. You can drill the steam holes into heads that don't have them as long as you watch how it's done on TH-cam before you do it.
@anthonynelson9136 I've raced without drilling the steam holes out before and never had problems. Good clean radiator with a well built shroud 👍
400 Mopar...... way bigger bore, unshrouded valves, Indy heads that are far superior to the Edelbrock... all around better engine to start with.
But the Buicks were the best...!!!
Flo Tech?? Waste...
Excellent flow numbers for half the price of AFR. For the savings you could build an entire turbo system 🤷♂️
@@LSxHunter So you install Assembled heads?
@@bluesky-ud9wg not typically but might as well get assembled and swap out what’s needed. Resell the rest or hold on for future things
400 chevy small block is junk. Why do you think they only made them a few years.
Oh and NO one builds the 400 sbc, it's on par with building a 305 or 307....stupidity.
th-cam.com/video/JqDp8faknec/w-d-xo.html there’s a few
I disagree both of the motors are good engine's as a matter of fact all the 400ci engines are good old school engines
That's not true. In dirt track racing the 400 has been the go-to block when rules alow them for nearly 50 years.
In hot rods, yes you're mostly right. Although if you aren't retarded and can keep your ride from overheating, there's nothing wrong with building a 400. Go with 5.7" rods though.
@@johneckert1365 You miss the point; the walls are already to thin, sure it you want to keep it NA it's fine but if not, it's a terrible choice
@@bluesky-ud9wg The 400 has thicker walls than a late 70's and newer 350 block.
400 sbc?? Haha, the cylinders will waffle as soon as it's started, lol
The 2-bolt 400s are fine. We’re not building for 600+, if we were I’d go for an aftermarket block for sure.
@@LSxHunter The 400 has paper thin walls & poor cooling, everyone knows this....
@bluesky1986 you must be young I got a sbc 400 stroked to 421 and I beat the shit out of it and it doesn't get hot and the cylinders are fine
@@WestcoastCreole I'm 52 and have built many engines. Ever hear of Waffling the 400?
@@bluesky-ud9wg I specifically use 2 bolt main 509 casting blocks which has the highest nickle content. Maybe i'm just lucky but I never split a block
I have a 376ci SBC with 455hp and 455ft lbs tq. in my 17' Super Sport Camaro 6 speed.🫵😁