Quote Originally Posted by FMXhellraiser View Post
Tech, on my TRW flat tops .030 over with 4 valve reliefs, it says 9.6:1 compression ratio with 64cc heads. Are you saying that is not true? I know that sometimes the specs on the directions or Summit are not correct and I have always thought this to be true with 64cc heads and also that would also assume that my deck has NOT been cut down any.
If each of the reliefs is 3 cc's, then 4 of them would be 12 cc's, which would yield 9.6:1 with 64cc chambers on a 355.