Hi!

It looks like I have a '89 350 corvette engine in my '89 Trans Am GTA. So the question: what should be compression ratio
for this engine? Now it is about 10. Is it good?

thanks,
Marcin

 

welcome to the boards,

stock i think those engines were about 9.5:1. The corvette aluminum heads are 58cc as opposed to the f-body ones which are 64cc. F-bodies have a compression of 9.3:1 with the 64cc heads. The corvettes only have a slightly higher stock compression because they used a thicker head gasket than the f-bodies at the factory to lower it. You probably have standard thickness head gaskets now and that's why it's 10:1.

This is exactly how my engine is being built, with the standard gaskets. You probably should be using high octane gas like 91 or 93.

 

Thanks for help.
So its all ok, I suppose