Originally Posted by lumberjack_43
okay and 72 cc over 64 cc combustion chamber will be less compression right?
That is true, but what actual compression ratio you have will depend on what piston - dish/flat/dome???
The more info you give us about EVERYTHING in the short block, trans, rear gear, tire diameter, torque converter stall, etc the better we can help you out.
You have given very little so far.