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- เผยแพร่เมื่อ 16 ก.ย. 2024
- 4.350 X 3.765, RaceTec pistons, 1.5/1.5/3.0 ring pack, 10.2 compression, Scat 6.385 I beam rods reworked, crank indexed and stroke set, .010/.010. Redline solid roller, .630/.630/260/270/108, Morel lifters, Harlan Sharp 1.8 intake rockers, Scorpion 1.7 endurance exhaust rockers. .080 Wall Smith Bros chromoly pushrods, Comp Cams 3/8 guide plates, ARP rocker studs. Welded 840 GM rectangle port closed chamber heads, 11/32 one piece bronze valve guides honed to size, Ferrea 2.250 intake valves, Ferrea 1.880 exhaust valves cut down to 1.800, fully ported, 370 CFM @ 28 inches, Edelbrock performer RPM intake, 850 Holley, 1 inch open spacer. GM 4 quart pan modified for oil control, 10/40 Maxima oil, six 51061 oil filter. Tested on 91 octane pump gas. 652 HP @ 6600-6700 RPM, 590 TQ @ 5000 RPM.
Professional Engine Building 201
The high performance big block closed chambered heads was 11 to 1 pistons and the L88 first design was upped to 11.5 to 1 pistons and the second design open chambered oval port aluminum heads had the 12.5 to 1 pistons. I lived and raced this period with the baby big block the 1965 Corvette 396 c.i., closed chambered iron square port heads that was rebuilt 30/over 13 to 1 pistons and a full race cam with upgraded valve springs. It never was put on a dyno, but the machine shop/speed shop estimated it should have been around 650 hp. It pushed my 1972 split bumper SS/RS Camero, (yellow & looked good), like it was that much hp. I had the M22 four speed that was going to replace the STOCK Turbo 350 that was starting to slip from foot braking that much hp, then my brother totaled the car when it was T-boned. Then I got married with children that made me store the engine until 2004 when I sold it to a guy that needed it for his 1965 Corvette restoration, with the months and weeks stamped or molded so it perfectly fit his Vette's body build date. I kinda wondered if that engine I bought actually came from that car. Be safe and healthy while having a good day.
Very nice build! I am always intrigued with 427 builds. You don’t hear much about them anymore even though years back that was the king of Chevy engines. Always wanted to build one with modern afr oval port heads and a solid roller with a tunnel ram for a street strip car with a manual trans! Fun I bet!
I’m always impressed how your BBs make so much power with such conservative compression ratios. Great job as usual Mark
True!💯 Mines made 565hp/600tq on 9.1:1 CR with a small camshaft. It idles at 600 rpm in drive😁
How Bout 990 heads ported???????? 12w 1/2 with rectangular heads.... From 1969...... ..that motor seen more than 650hp...........
I just happen to have a set of 840 heads dated 69 AND a 1970 L78 block. Funny how a lot of people don’t like the 840 heads.
Great engine. I remember the L 88 s of the 70s. My favorite
I'm just now seeing this video you guys are the greatestI have a 68 427 I'm about to build that came out of a 68 corvette
Mark, you are the man … I’m saving my money for one of your 650 horse 496
Did you end up buying it yet?
Id be careful, i ordered a tunnel rammed big bore short stroke 352 sbc from him about 2.5-3 years ago, sent him the deposit check and never heard from him again. He doesnt use email or give receipts so i have no leg to stand on
I’m building basically the same engine at the moment with slightly smaller solid lift L88 grind comp blue print cam, a ported 840 heads with 188 exhaust and 230 intake valve. Forged internal balanced crank and 40 over forged pistons. I hope it makes hp even close to this😎👍
How did it do.?
Thanks for all the information, I refer to your vids for my big block build a street 540 tunnel ram hydraulic roller would like to see more of that soon. Thank you Sir
The greastest engine ever produced. 427- the legend!
Man! It ain't playing around! Sounds Fantastic.. No delay at all..
You guys obviously do great work but people want to see some of that work you guys do not just the engine getting plopped on the dino ran a couple times sure we like that but only after we see some of the parts and labor in time you put into the engines you got good stuff though.....I LIKE IT
I had a 2nd design L88, 1969 model w/ .560" x .580" factory cam? (sorry, I measured and not sure it was right), with the 850 holley best of 10.82, at 123.w/ 11.5x28 x 15.
2x 660 center squirters on a Wiend tunnel ram on it and it ran 9.82 at 139 with Blairs Steve B. tuning it. (I couldn't get it to run but 11.3's). Those engines were the bomb!!!!!(not legal for anything short of C/gas)
Man that motor really makes some good power I sure wish my 427 would make that kind of power I know I'm not running near enough cam shaft to make any real power it's a howards hydraulic roller 235 x 241 @50 618 lift on a 108 lsa I do have a good set of AFR 265 oval port heads and my compression is around 10.5 to 1 the motor has not been on the dybo yet I was hoping for 550 hp but I'm sure with that cam I'll be lucky to make 500 hp. I love your videos
Sounds great I have a steel crank from a 366 and a 4 bolt main 454 block I plan to build a similar engine
Hell of a motor
Great work Mark thanks .
Great to see new engine videos! Keep’m coming.
Sweet. Would love to have seen how much it would pick up with a single plane intake with that nice large solid roller.
Is there a benefit for a longer rod for the 3.76 crank or is it more for reducing piston weight? Also is there a secret for making solid rollers live on the street these days? Seems like not long ago there was lots of solid roller failures. Thanks for your time and great videos!
Your back! Im subscribed to both channels
Thanks!
Great build recipe Mark!
I didnt understand your comment on connecting rod length. Im gathering parts for a 427 build now. I have a standard bore 4 bolt main 454 block, a forged 396 crank and a pair of LS6 large rectangular port heads. What connecting rod length and pistons would you suggest for a short deck 454 block?
Very nice build
If things ever get straighten out I this country and things get remotely affordable again I'm going to build an l88 427 Chevrolet Big Block Stroker
Just build a 454. It's a better engine.
427 big block stroker...?
I have a 427 60 over that makes good power 661@6000 rpm 605 torque it's got afr 265s on it I have a hydraulic roller in it now but think I'm going to put my solid roller in it it's 256x260 duration 666 lift on a 110 lsa I think it will get me about 30 more hp.
wow more than I woulda guessed! Very nice
All you hater keyboard experts make your inexperience obvious by your comments
Awesome build. Quick question: Relatively short stroke and fairly mild compression with long duration cam. Help me understand how this motor is cranking out 590 TQ. Thanks in advance!
Ok- 590/447=1.32 TQ per inch, 660/496=1.33 so as you can see its not a crazy number, then theres were intake valve closes, and the dual plane intake.
Great video! How much does this motor cost to build? and, which aluminum heads do you recommend for a similar build? Joe
From what I've heard about you, I consider you to be an expert head porter, and engine builder. Do you get a chance to cc the intake ports on those heads after you finished the port work? I'm just curious what the final total volume of the intake ports is. I realize that the contours and shapes of the ports are more important than the actual volume. But I'm just curious.
He didn't say he ported them. Valve job, bigger intake valve, fixed a spot, and new guides is all he said he did.
@@SealofPerfection You don't read so well, do you? Maybe look at it again, I'm sure it says "fully ported" in there somewhere.
@@Anarchy-Is-Liberty He says nothing in the video about any port work. That's what I went by.
How much for porting
She's a screamer
Which heads did you use....
840 rectangular port heads
I wander if it would make more power with 781 heads
I have questions on valve size. First why 1.80 and not 1.88, was it because of the head damage or is there a performance gain from the smaller size? Also, your 049/781 usually get 2.190 intake valves and not 2.250. Is that because there isn't enough cross section in the port to make use of that much valve?
1.800 was used to keep the valve away from the chamber. Factory bowl is to big for a 2.190 valve.
Can you send me the cam specs and who made the cam I am building a 427 right now. Thank you.
looks like cast heads. not aluminium?
What is an over the counter l88?, i have a 489ci something or other bbc with rec open ports.
😮😮!
Mark, What off the shelf roller cam for the drag strip?
I have a
468 bbc
781 heads big valves port matched tunnel ram Holley 660 carbs
10.5 compression
4 speed
1/8 mile gears
Where do you race, compression?
@@VORTECPRO Madras Oregon 1/8 mile. 10.5 compression.
What was timing on it?
38 degrees total
What is the timing set at? I guessed 675hp
Though L88's had aluminum heads on it? To me this would be the copo build.
Over the counter first design L88 short block, owner added 840 heads, very common back in the day.
OOO didn't no that.
Early l88 had iron heads , went to aluminum 842 than 074
Why do you use 1.8 ratio on the intake and not on the exhaust?
I figured you would know, but it seem you do not.
@@joe-hp4nk , I cannot answer for Mark, but usually the exh does not benefit from additional lift or rate of lift, it's normally counterproductive. The intake is different ,( usually), in this respect.
It's not an L88 in any sense. It's a built 427.
HAHA, this engine is no more an L88 than I am, L88's had Aluminum heads and over 12 to 1 compression this engine is just a hodge podge of after market speed parts, false advertising.
I have a real L-88 over the counter short block crate engine, has the CE stamping on the front pad. I also have a pair of 074 aluminum open chamber heads, both were purchased from Chevrolet in the mid seventies. I raced the 427 in my 68 Camaro for about 5 or 6 years and then switched to a LS-7 454. The L-88 block has no wear at all and the cross hatch is still visible on the cylinders.