I was trying to figure out what the cc's of a stock LT1 head was, aluminum in my 96. I was searching and seen that it was like 53 cc. And I was trying to calculate my compression. The pistons are 0.7 cc's for the valve reliefs and it's a 388 so I believe it is decked .030 and also I think the stock head gasket is .020. I dont know if these numbers are exactly correct but if I had the cc's of the head I would be more accurate, and bore is 4.060. Someone told me also that the heads were like 64cc but I read they were 53 or so and on the corvette too, that's how I came up with 11.7:1 compression. Thank you for s omeone who can help me figure this out.

 

the 11.7:1 was with 64cc

 

The specs list the LT1 head CC as 54cc., but I've seen people claim they measured as large as 58cc. Definitely not 64cc. But since your heads are "P/P" according to your signature, you would have to measure your heads, not use a generic value for a stock head.

Are your valve reliefs really 0.7cc?

 

Nvm it's +7.00 cc to combustion chamber. So I calculated it 12.1:1 compression. So would this be the cause for my PING? I'm only running 93 octane.