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Old 02-07-2004, 01:21 AM   #9
lukecp
Formerly yellow72custom
 
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Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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.
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