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.
____________________________________ LukesVette Homepage Veteran of Operation Iraqi Freedom
God Bless America Support Our Troops
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.
Corvette is a registered trademark of the General Motors Corporation(GM) &
Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise
noted) and does not claim or imply that Chevrolet or
GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated
with, sponsored or supported by GM. Copyright/trademark/sales mark
infringements are not intended, or implied and are in fact used to support
GM, Chevrolet and Corvette.
Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS
Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982