I have a 1971 corvette 4 spd with gm crate motor 10067353 in it. I am looking to get more out of this engine while keeping it streetable. Some people have told me I can change out the heads, intake, and cam and get great results. Others say I should just buy a new engine. I am not a motorhead although I am trying to read as much as possible. If anybody has any experience with modifying engines I would appriciate and information. Thank You for your time..
Well, what you got there is a 195 hp engine... 4 bolt main, 76cc heads with 1.94 intake, 1.50 exhaust valve, .383 lift intake 194 duration, .401 lift exhaust lift 202 duration, and.. 8.5 compression ratio... with all that known, a cam change and head change would do a world of change. As for what to change them to, well, everyone has their own idea of that. Ask around for a good cylinder head type(preferrably a 64 cc, maybe a 58cc chamber) and a good camshaft profile(old school designation would be about a 262 to 270 duration...get any higher and you could have vacuum issues at low rpm(ie headlights not wanting to raise easily :)
StingrayJim NCM Lifetime Member #1936
Stingray's '76 StingrayJr's '78 Lil Red '94 (click each one to see a bigger version)
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
cam, lifters and pushrods. $150
headers - $100 (cheapest)
carb - $275 - I'd go with an Edelbrock
gaskets, RTV, plugs etc - $75
timing chain $60 (always replace if you're swapping a cam unless it has low mileage on it)
water pump - same rule as above!! $50
edelbrock also sells kits with the heads, cam, lifters, intake and carb. I think they also include gaskets. May save you a few dollars.
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I am in the process of building a new motor for my 81. I started with a block and crank from a 69 chevlle. I put a comp cam 268 xtreme part number CL12-242-2. I am using the original heads with 1.5 ratio roller rockers. I am going to use a Edelbrock performer rpm intake and 600 cfm carb. The intake is a little large for my setup, but it was free and will work. A friend put all that info in some program and I should get a little over 300hp from this setup.
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