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Old 06-04-2012, 09:16 PM
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First 383 stroker how much horse power and any advice on what to change

1967 chevrolet Impala

Scat Crankshaft Part #SCA910375 , 2-Piece Seal, External Balance, Cast Steel, 3.750 in. Stroke
Camshaft, Hydraulic Flat Tappet,@.050 lift 214-224( Advertised Duration 280/290) , Lift .443/.465 degree lobe center 112,
Rod length 5.7 9.3 compression ratio forged pistons
Part #042670-1 World Product S/r Torquer heads with some work 76cc
Part # CCA-17001-16Comp Cams 1.5 Roller Rocker Arms
Part #7101 Edelbrock performer RPM intake
Part #1405 Edelbrock 600 carb
Part #85551 MSD Pro Billet Distibutor
MSD Ignition 6425 - MSD Digital 6AL Ignition Controllers
MSD Ignition 8202 - MSD Blaster 2 Ignition Coils
Th350 trans stock stall
Stock rear end 1967 Impala Rear End
Summit Racing Headers Part #G9001-9 Primary 1 5/8 3”collectoreaders
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Old 06-04-2012, 09:41 PM
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Really round numbers . . .400 HP if you're lucky. But a fun engine to drive with.

PatM
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Old 06-05-2012, 03:42 AM
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Quote:
Originally Posted by Mr. Mars
1967 chevrolet Impala

Scat Crankshaft Part #SCA910375 , 2-Piece Seal, External Balance, Cast Steel, 3.750 in. Stroke
Camshaft, Hydraulic Flat Tappet,@.050 lift 214-224( Advertised Duration 280/290) , Lift .443/.465 degree lobe center 112,
Rod length 5.7 9.3 compression ratio forged pistons
Part #042670-1 World Product S/r Torquer heads with some work 76cc
Part # CCA-17001-16Comp Cams 1.5 Roller Rocker Arms
Part #7101 Edelbrock performer RPM intake
Part #1405 Edelbrock 600 carb
Part #85551 MSD Pro Billet Distibutor
MSD Ignition 6425 - MSD Digital 6AL Ignition Controllers
MSD Ignition 8202 - MSD Blaster 2 Ignition Coils
Th350 trans stock stall
Stock rear end 1967 Impala Rear End
Summit Racing Headers Part #G9001-9 Primary 1 5/8 3”collectoreaders
If it were me, I'd go with a little better head with 64cc chambers and a bit more cam in the 230 range.
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Old 06-05-2012, 05:26 PM
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He's already at 9.3 compression if he measured it correctly. No need to go to 64cc heads, I would jump up to a roller cam though. You've spent a lot of $ on ignition components and forged pistons and stuff don't cheap out on a generic cam. What gear ratio is the rear?
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Old 06-05-2012, 07:44 PM
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You built a big cube small block and topped it all off with stuff that would work on a 327. Small heads, really small cam, small carb, etc. You have an excellent manifold and a nice distributor. The manifold will work very well from 1500-6500 but your engine won't rev anywhere near 6500 with that cam and those heads trying to feed 383 cubes. It's going to make some good torque though and be a 100% street engine.

You didn't say what your goals were so it's hard to recommend what to change. If you want a mellow cruiser for the street that's easy to drive and makes power right off of the bottom, then you did a good job.

If I were building a 383 for the street, I would want more power and not give up anything down low. I would go with an aluminum 195cc head from AFR. I'd keep your intake manifold and your distributor, and then rock a roller cam around 230/236 with .575"ish lift on a 110. For a carb I'd get a good QFT vacuum secondary with 800cfm. I'd keep compression near 10-1. It would make 450-475hp, idle at 750rpm, pull good vacuum for brakes, and make near 500 ft-lbs of torque.

^^That cam might seem kind of big, but it will behave like a 222/226 cam on a 350. It will have just a slight lope to it. Big cubes tame camshafts.
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Old 06-05-2012, 08:03 PM
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parts

i did the idiot move and mixed and matched the parts myself

I want a driver that the average joe smoe with a stock 85 to 93 mustang with a few bolt ons cant touch

Last edited by Mr. Mars; 06-05-2012 at 08:27 PM.
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Old 06-05-2012, 08:49 PM
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Quote:
Originally Posted by Mr. Mars
i did the idiot move and mixed and matched the parts myself

I want a driver that the average joe smoe with a stock 85 to 93 mustang with a few bolt ons cant touch
The average Joe Schmoe with a fox-body Mustang will be running low 13's. To get your 4200lb Impala to do that you'll need 400hp.

To answer your pm question, yes you can run a stock stall with the cam that I spec'ed. The tune will have to be real good though. I would put a 3000rpm converter in it too. One that is "tight" so it drives very much like stock when you aren't hard on the gas, but when you mash it, it flashes and throws you into the seat.
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Old 06-06-2012, 07:58 AM
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You built a good truck engine!

If you're over budget, toss it in and drive it, get a set of better heads and a carb and get that broomstick cam out when you get the time though or...theres always nitrous
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Old 06-09-2012, 07:51 PM
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You've spent alot of money on parts like ignition but seem to be skimping out when it comes to headers and the cam. I would get rid of the MSD, get a another brand of HEI, to save $$$$$ and get a better set of headers. Supposidly, those headers are meant to be like the Hooker ones, but generic isnt always the same. Otherwise, i would keep the rest the same. I would also get a better set of heads, you could always pick a set up off craigslist (tons of them on there). You wont be able to Rev that high with those heads on that 383. Just my $.02.. Good luck!
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Old 06-10-2012, 07:08 AM
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I think you've done OK....

That small cam and heads will get the big Impala moving in traffic. You are not driving a lightweight car so the smaller cam is what you need for a good street engine with reasonable fuel economy.

I'm no expert on late model Chevy heads... but we ran Ford 351-C's on dirt and the small port 2V heads worked better than the huge 4V heads we could have used.... you should be OK.

Put some miles on it and see how it works... you can always change the cam and heads. But it looks like you have a solid foundation.
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Old 06-11-2012, 10:28 AM
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one thing i wold worry about is that you mention that the pistons say 9.3 compression ratio, in order to get 9.3 out a 76cc head with proper quench is to run about a 7cc flat top, which may very well be what you have. but more often than not a piston that is advertised as 9.3:1 is a 18cc dished piston matched with a 64cc head. what pistons exactly do you have, what is the cc in the crown of the piston.

i'm not a fan of those heads, they came out in the 80's and pretty much haven't changed any. the cam is a bit small but it does match the heads. since it's going into an impala i would suggest a short gear like a set of 4.10-4.33:1, put a shift kit in the transmission with some slapper bars and i think you would likely be in the 13.80-14.20 range in the 1/4. the bad thing is that the fox bodies you are trying to be ran about 14.50 from the factory and they dont take much to make them faster since the 302 likes rpm and the fox body is light.
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