What Cabelguy said. Flattops are completely flat, except most have small valve reliefs in the middle. You proably have like 8.0:1 compression right now.....64cc heads would put you into the 89 octane gas range. I run 89 octane in my flattop-pistoned 64cc chamber 350 and it works pretty good.
__________________
'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride.
'70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck.
'97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg
|