Compression Help
 

I have a 415 SBC race engine that was built for circle track. It has had the block zero decked and has Flat top pistons. It curently has vortech heads that have been milled. The compression is right at 12.5 with this combo. I want to run this motor on the street. I have a set of dart 64 cc heads. With these heads will the compression drop enuff to run 93 otc. pump gas without hurting the motor?

If i did the caculation right, you currently have a 4.125 X 3.875 with 58CC heads, which equals 12.53 compresion useing a .041 head gasket. If you go too 64CC heads and a .062 head gasket, you can end up with 11.08, which will get you close to pump gas specs.

JMO

Zip.

Thanks for the info Zip.