Compression ratio... Stock vs. HCI setup

[Strype]

Hey guys,

My 93 notch has GT40X aluminum heads (58cc combustion chamber) and a stock bottom end (65,900 miles). From what I gather, the stock compression ratio is 9:1 and the E7 heads run a 60-62 cc combustion chamber.

I know that even my head gasket can change the compression, but what is a good guesstimate on my compression ratio?


I don't know if it helps but I am using stock push rod length, 1.6 roller rockers, roller lifters and a b303 cam.

 

[bwguardian]

You should be close to 9.5 to 1...I just finished a build with 58cc GT40p heads and a E-303 cam on a stock bottom end with about twice the miles yours has.

 

[Strype]

Awesome thanks!

I was just wondering