my motor is a 350 .030 over. the heads are world product 67cc heads. the cam is a rpm performer and the pistons are .125 domed I think the compression is around 10.5 - 11.1:1 but I'm not for sure. Is 93 octane good enough fuel for this engine. I can't get full advance without detonation and I keep burning head gaskets. Can anyone answer my qustion and help with my problem. I was thinking about putting on 76cc heads to lower the compression. Will this help and will lowering the compression kill HP, or will it run better because i'll be able to get full advance.

[This message has been edited by mustangs killer (edited March 06, 2001).]