Sep 13th, 00, 06:36 AM
I am considering picking up a set of later model Aluminum corvette heads for my 350. I know they use angle plugs and center bolt valve covers. Anyone have any experience with these heads both performance wise and conversion problem wise? Thanks.
Mark W. Winning
Sep 13th, 00, 08:55 AM
I have a set of Corvette "113" Aluminum heads and I love them. They flow real good stck and even better when pocket ported.
Just watch though, if you are putting them on a older motor because they have only 58cc combustion chambers.
1992 Firebird 355/Six Speed
1991 RS 350 / 700-R4
1987 Toyota Pickup 383 / 500 + HP 10.963 @ 119.95 Slicks / 11.997 @ 114.23 Radials
Sep 13th, 00, 04:26 PM
There are two types of alum heads for the Corvette. The L98 heads, used up to 91 or so will fit and work pretty well as Mark notes, but the later LT1 heads are somewhat different and from what I understand won't work on the earlier engines. Cooling passages are different?
Sep 15th, 00, 03:08 PM
Mark is right about the combustion chambers. I started out with a ZZ3 HO 350 and when I rebuilt it I wanted to upgrade to forged pistons. I had to use the TRW blower piston with a 21cc dish to get a 9.5:1 compression ratio. These pistons are heavier than standard flat tops, but are also stronger to hold up to the additional cylinder pressures. I didn't mind the weight since I also added a blower to my engine.
Bottom line is that it will be hard to find a piston, other than a stock replacement hypereutectic, that will give you a streetable compression ratio. Most of the other forged pistons were in the 11-12:1 ratio range.
Hugger Orange & white 69 Camaro with supercharged 350, Tremec TKO, and 3.73 12-bolt
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