Jeff Smith's Garage Big Block Chevrolet Engine Combos
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- เผยแพร่เมื่อ 5 ต.ค. 2024
- Jeff Smith, former Editor in Chief of Hot Rod and Car Craft Magazines discussed his favorite engine component combinations for the Big Block Chevy engine. With a focus on a high horsepower street-based engine, these tips can he helpful to anyone looking to build one of these classic engines.
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I've had my 68 Camaro with a 396 for almost 30 years puts a smile on my face every time I open the 4 barrels keep the big block videos coming
My big block scares the hell out of me THEN puts on the smile 😂
Couldn't help but notice that this video about bigblock Chevy combos has 50,000 views, and the video next to it about LS combos has 2700 views. That says alot despite popular opinion. And yes, that cam suggestion is pretty weak. Bigblocks like big cams, big heads, big carbs & intakes and big compression. If your gonna take the weight penalty of using a bigblock Chevy, it better make some serious power to justify it. A mild bigblock is a waste of a beast of an engine just waiting to be unleashed. MK4 BB Chevy was based on a NASCAR engine from 63. So it was born to run.
I’d definitely like to see more big block videos, I highly enjoy the content! I always check in to see if you post any “new” and haven’t seen any. It would be nice to see you do a series of engine builds step by step,👍🏻🏁
Good video! Trying to build my 427 back for my 56 Chevy. Starting over from scratch. :) I'm in my 70's, so I hope this is the last time I have to do this. ;)
Gotta love the big block chevy! Running a 555ci, Brodix BB2 heads, edelbrock rolling thunder,248/256 duration 632/648 lift. 11" vacuum, manley crank and rods, mahle 10.5 pistons. Runs on pump gas and drive it all the time. Fun to drive!!
Thanx Jeff , im adding that same cam to the 461 in my 72 ss elky. Thank You for the years of enjoyment ! I grew up in the 80’s as a teen with your contributions to Hot Rodding !
Thanks Jeff, picked up a BBC core motor dirt cheap and my 10 year old son is stoked about seeing how things come and go together. Looking forward to future videos
L
Hi Jeff .! Love the video.. the explanation of the parts was very well done..
Man . I have a 468 /400 combo.
3400 stall
Ford 9” n cased 31 mosers tru trac and 3:25 gear set .
All marketplace bought and
built for best dollar invested…
The torque of these big blocks .. is really awesome. Timing flow and well ..
Purple octane.. makes it that much more fun.
The best of torque
1:1 at
45 mph with thrush mufflers …
Sounds of a 9ft horse galloping down the road .. feather pedal.
The oval ported head at 4500 and up insane..
My stock shifting 1-2 killed its run .
4200 stock shift . Dropped her right down .
5200-5500 is the happy spot on this set up.
Great insight from years of experance. Keep it coming Jeff, I'll be watching. Mike LeFevers
Hey Mike, it's good to hear from you. Thanks for the support!
You popped up in my feed as I was searching for tips on a BBC I want for a corvette project. Thank you for the plain speak. I’ve subscribed.
I'm building an oval port 68 396, 500- 540 hp. Good info right there.
Never seen your channel or videos before but the TH-cam algorithm randomly brought this video up. I sub'd now. Thanks for sharing your BBC build info.
Very glad I ran across this video I have a 427 T bbc and ive been looking for recommendations for my combination heads/cam/ intake/ rotating assembly. If anyone has any experience I’d appreciate the guidance!
Hey Jeff I just watched your big block combo video I have a 427 that's 0.60 over so a 439 it's 10.5 to 1 compression it's got a Howard's hydraulic roller 235x241@50 with 618 lift and a 108 lsa it's got a forged crank good gm dimple rods and a set of AFR 265 oval port heads it made 661 hp and 605 torque on the dyno I know this is a great street combo but I want it to be a Lil more nasty I have a comp cams xr292r solid roller that is 254x260@50 with 660x666 lift on a 110 lsa what's your thoughts on doing this cam swap I don't mind the Lil extra mantnince with a solid roller?
I like it. Jeff Smith articles seemed to be right on point as well. I have a couple of big block 402 engines, I know they are not 454's but I am going to use them any way...in a street in my 78 Malibu and my 68 impala. I would like to see some combo ideas.
Just found you're channel 👍 like it.
9:30 Right, if you have deep pockets, sure you can do it. In the end, I have a bare basic 454 bored .60 over to 468. A pair of oval port 781 heads and a mild cam. A performer dual plane intake and a 750 dual feed double pumper. It makes 550 ft. lbs. of torque at 4200 rpm and 500 hp at 5700. All on pump gas. As cheap as you can. No high cost roller shit. It's more money than you need to spend for the same result.
Hi Jeff, Can you do a video on BBC Gen V, VI heads on a mark IV block? Talking about the series and parallel flow of the blocks, heads and gaskets. Thanks
I have a comp cam magnum hf 286 its 236/236 @ .050 .555 lift with 1.72 rockers seems very similar to the roller cam he recommends idles at 800 rpm 11 hg of vac at idle 12 13 at a fast idle off idle power with a 2600 stall converter pulls to 6200. power brakes w/ vac can work great heavy car with ac been in car for years very reliable.if your on a budget and your first big block use this cam..
Good info. I bought a 84 c10 with a 454 +.030 over, icon pistons and a summit 1796 cam. I think it has stock iron 718 heads and stock springs, rockers etc. Holley 750 double pumper on top of a TSP air gap intake and a TH400, spin tech pro street 9000 mufflers. Runs smooth , sounds badass and fun but is lacking true HP. What should I do? I want a street 600hp motor.
Gotta port those heads and work on the short side radius and a good valve job and proper springs for your cam. Get with Chris Straub for a cam recommendation. Also 10.5:1 compression. That’s all you need to get 550-600 HP. If your heads need much work just buy AFR or Brodix 265 oval port heads, they’re good for 600+ HP out of the box.....
Awesome vid, great info
Hi Jeff
I’m in the process of building a 489 and was wondering how you think the Mama Bear cam would work with 10:1 compression, and a set of AFR 335 Enforcers. Great video ..
TIA
Back in the day what size tires and rally wheels did you run on your high school chevelle?
Thanks for these great videos!
Comp cams 236/242 is a great cam also
I have a L78 with 840 heads, the thing will turn like a 327 but with the torque of a big block.
What modern aluminum head is identical or as close to identical as possible to the 840 head?
For the street a set of Brodix Race-Rites can't be beat. But, a nice set of 781's or 049's will get you close. A old Performer RPM intake with a 1" spacer will duplicate the performance of a Air Gap. Look into the Chris Straub hydraulic roller grind sold by Clay Smith Cams, especially with the GM iron heads.
That cam with oval port heads is a torque beast! Just got my 72 C10 454 +0.030” running with that HR cam and when the back barrels open up on the 3310 the truck goes sideways in 1’st or 2’nd gear. Cam is 221/235 @ 0.050” and 0.578”/0.578” lift on 109* LSA
520 lift on a big block is tiny. That’s like factory specs
Mike - yes teh lift specs are a bit soft. There are some new lobes that Comp has created that offer more power with similar lifts specs - the key is additional lift is generated on the closing side of the lobe - where you have lots of velocity even with the valve closing. I did an A-B test on an LS engine with similar lobes and picked up 15 hp from peak torque to peak hp rpm point. Otherwise the specs were almost identical! I need to do a video on that.
Pretty weak. I'm using a .748/.748 lift, 288/296@.050, 110 lobe sep stick in my Rat. I'll probably drive it more than he does that mild engine. And I'm using a tunnelram and heads that flow.
Nice to see you on video. I realize you are a hot rod guy, but wondering about building an L18 496 for towing. I would like to build for 89 pump gas. What would be a good compression ratio with aluminum heads? Also cam spec with said head as 3,000rpm is a good cruising range. 500 to 550 torque and 400-450hp is enough. Been a diesel guy, but emissions are an expensive problem.
You do know that this is a different engine from the MKIV and Gen V and Gen VI big-blocks. Your engine was a complete redesign. I do know that the heads do not interchange so you will have to work with that casting. As far as compression - I would keep it around 9:1 just so you could use regular pump gas. I'm not sure there are aluminum heads available for this engine. I know Dart used to make iron upgrade heads - you should contact them to see if they are still available - I think they stopped production on them last year. Comp does offer a few camsahfts for this engine. The XR264HR - PN46-413-9 might work well. Hope this helps.
@@jeffsmith2003 Thanks raylar seems to be the go to... if i went alum heads would 9.5 cr be pushing it with a tune? Love your writings and channel!
@@jeffbarnes9331 I think a 9.5:1 compression ratio would be okay. It really matters more how efficient the chamber is rather than aluminum vs iron. I did a test on that many years ago and the aluminum made more power! I don't think the material is a concern. Aluminum is beter because its lighter and easier to repair.
82 short bed build 396 and I'm having a hard time deciding what to put in her I wanna run a mild cam with the 750 carb cam is really where I'm stuck at
Call Chris Straub! Can’t go wrong!
You used to read everyone of your articles with car craft and et cetera
I'm still pissed off that you didn't accept my friend request on Facebook. Been following your work since you was a young wet behind the ears staffer at Car Craft back in the early 1980s. Probably have every magazine you ever wrote an article in. So I kinda felt like I knew you thru your writings. I remember the 283 you built about 40yrs ago and put it in your 66 Chevelle.
all you got to look for is the 402s cubic inch Chevy big block engines in any of those double ports will work fine they also make aftermarket cast iron heads when I bought a set they were only $730 each can imagine what they would cost now
I read one of your articles where you did a roller retrofit on a 454 and you used the comp xr276hr cam. You said your friends car had 3.08 gears and with traction it would run 11.50 1/4 miles. What torque converter stall did you use in the simulation?
What’s your thoughts on the Dart 360 super aluminum head rectangular heads? I have a 496 custom cam and am wondering if this head is up to task running a 8 stack efi
Kenneth - I think that would be a good choice. I don't have any personal dyno experience with that particluar head but Dart knows how to move air so it should work well.
I am rebuilding a BBC 408 and wonder how this cam would work in this smaller BBC. Will have ovel port heads with 219 -188 valves and around 10-1 compression
How did your rebuild turn out? I'm building a 408 now. I got a custom roller cam from Cam Motion, Johnson roller lifters, Brodix RR Oval ports with a downsized intake value to add clearance and Icon forged pistons. Should be at about 10.5 compression. The tech at Brodix that helped me choose the heads said it should be good for 600+ hp.
Good lookin Old Guy..LOL Great job Jeff!!
What do you think of speedmaster cylinder heads? They make an as cast oval port with 2.19 and 1.88 valves.
Hey Jeff what's your opinion on a 454 gen v flat top with the aluminum assault heads victor jr single plane with lunati 605/613 hydraulic flat tappet 850 carb for index racing?
A good cam for mild engines is a 274 to 284
Where's all the tech you were going to add to the bottom. Cam sizes and whatnot
Yeah, what he said.
If you look at the video at 8:56 - inside the dyno curve is the information on the camshafts - specs and grind numbers. At 9:04 is a list of all the parts we mentioned and the part numbers.
Jeff you need to get up to date and check out the CID BBC head. Nothing better but not cheap.
What would u recommend I got 454 gen 5 what kind of heads and carb u recommend it has a 520 280 Comp Cam
1st time viewer! I haven't seen the video yet, but can tell it is going be good, instant sub and bells! :) Maybe a comment after I see it. lol :)
I knew It!! :).. I'm hooked... Great video Jeff!!!
Thanks Jeff...
Jeff:I found an XR 282 HR-10. With an Exhaust lift of .510 instead of .520. Is that the same cam? I was thinking maybe it was a misprint or something. Let me know if you can and I appreciate all your help!
That is the same camshaft at 0.510 lift.
Appreciate your time Jeff. Thanks!
I'm replacing my 57 Chevys 327 engine with a blue print 540 CID engine. What headers would fit on this... any ideas?
Jeff, I want to build a 700 hp barely streetable 427 Chevy bbc using 290/300 cc oval heads. Is it possible?
I have kind of a long anxwer for you that may not fit here - send me an email at lanejsmith@yahoo.com and I'll send you my ideas. At least this may start a discussion about what you are looking for.
I have a tall block p ock 427 and wish to run a stroker crank and rods what combo do you suggest?
Jeff Smith Car Craft editor?
former editor - but yes!
do you know if the heads on that 489 were ported and what compression it has?
The factory aluminum heads on that particular engine were not ported but the combustion chambers were milled before I received the engine so the compression is right at 10.5:1.
Good info thanks
Im building a 9.6:1 496 with worked 781 GM heads. This engine will be going in a 1985 K5 blazer. How do you think the Comp Cam XR282HR which is the 230/236 camshaft would perform in this application?
An answer is it depends upon how you intend to use the Blazer. If it intended to pull torque at low rpm like out in the woods or four-wheeling, something like that then the cam is probably one size too big. but if street performance and more midrange to top end power is your goal then that cam is probably a god choice. Hope this answer helps...
@jeffsmith2003 The K5 is gonna be a weekend toy, mainly street driven with occasional off-road use.
How many CFM in that carb
Fel-pro says they head gaskets that allow you to Mark4 head on later blocks and vice versa.
I can't get a handle on the details, can you shed any light on this subject?
Generally speaking most aftermarket BBV heads will work on either MKIV or Gen V-VI blocks. Where you run into trouble is with production heads. You cannot run a production MKIV head on a Gen V or Gen VI block as this will cause coolant leaks because the Gen V and VI blocks coolant holes have been modified. This is a much deeper subject but the above statements should keep you out of trouble. I can't answer with more clairty since you didn't offer any specifics as to what you are trying to accomplish. Hope this helps.
@@jeffsmith2003 Thanks for the reply. What you stated is the common wisdom, don't try to put Mark-4- 781 heads on Gen 5 or 6 blocks. The potential coolant leaks aren't worth the risk. Most if not all aftermarket heads with work on either. Don't get too fancy with the mix and match. Thanks again your videos are very helpful.
Dear smith and garage, would you help me? What is the smallest cam i can get away with for a 607 BBC ? i want to run the smallest comp cams XR hydraulic roller. And AFR 265cc heads or smaller. And building a cross ram intake for it with modified holley carburetors. It is for a 2nd gen camaro with a mile of set back, daily driver.
Jeff will be in touch - CB
Not a expert but I have a rolling thunder in my 555ci. It has 248/256 duration 632/648 lift. 11" of vacuum. I drive the car all the time. Might be a good cam for you. I really like it!!
Can a big block be D Stroke 396
Love bbc but iron heads weigh a ton.
Can anything be done with a gen v 454
Sure, the big difference with Gen V is the change to the one-piece rear main seal, hydraulic roller cam, and no mechanical fuel pump provision. But the same potential upgrades can be done to that engine. Gen V modified the water jacket outlets on the deck surface slightly, but most aftermarket heads now have been modified to accept those revisions. You will need a camshaft that has a stepped nose that accommodates the limiter plate used on the Gen V which is nice because then you don't need to mess with setting camsahft endplay with a cam button - the factory did that for you! There are stroker cranks available and piston selection is roughly the same as Gen IV stuff. So yes, there's a ton of potential for the Gen V engines.
Who the hell is Cameron Benty?!?!?!
Jeff's partner on this endeavor!
Thanks
&
My 1975 Cadillac El Dorado Convertible thanks you
She wants t’RUN!
*467
Afr heads ovals , way out in front
This sounds more like a commercial pushing products for sponsorship than a practical guide. Not everyone can afford aftermarket heads and mega dollar carbs or even need that for a street engine.
A valid opinion. First of all, there are no sponsors of Jeff Smith's Garage. I did this video to pass along some of the things I've learned from years of dyno testing engines for the major magazines. None of the manufacturers mentioned in this video asked me to do this. I did it as a service to our viewers. The only agneda here was to put out some information that some might feel is helpful. I want to make that very clear. There are perhaps 5,000 different combinations depending upon your specific needs and budget. Sure, there are other less expensive avenues. For a typical street 454, the 049 iron oval port heads can be built into decent street heads especially if you can afford to have the intake valve size increased to 2.190 from 2.06. I would leave the exhaust valve size at 1.7 .2-inches but you could increase the diameter to 1.88-inches. But - by the time you invest that much money into the increased valve size, you have spent about 70 percent of the cost of a set of Edebrock Performer RPM aluminum heads - nobody tells you that until you've already spent the money. I'm telling you this now to save you the grief. Plus, the 049 heads are becoming hard to find. So then you're down to stock heads - sure you can run stock heads. Perhaps I should have made that point in the video but it wasn't really the focus. So the question becomes would you want to spend $900 upgrading a set of iron heads when you could have a set of aluminum heads that would also shave 50-60 pounds off the nose of the car all for less than $1,500? The Edebrock Performer RPM heads are currently selling at $1,500. Frankly, if you can't afford another $600 then we really are not talking about performance anymore. Hot rodding has never been and never will be an inexpensive hobby. In keeping with a budget approach you could certainly go with a flat tappet hydraulic cam. Again to match this package a cam with roughly 225-228 degrees of duration at 0.050 would work well. I would match the iron heads or the Edelbrock heads with a dual plane Edelbrock performer RPM or Holley intake and a 750 cfm carburetor and and HEI and that would be a nice street package that would probably make around 540 lb-ft of torque and 525 hp.
5000 rpm bbc weak
Perfect for street driving
CORRECT@@musclebone7875