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To be on the safe side with a carb motor --pump gas = low compression or it will not last very long -- 9.5 every day car / 10 or 10.5 u need 100 octane BLEND at times temp related -- 11 on is all race gas -- 13 is a pro shop with lots of money to get that -- just because the comic book said its 13 don't believe it -- very difficult to obtain and costly --- camshaft occupation is the key to high numbers -- the more duration your camshaft has the lower the compression will end up being -- and the less duration the higher the static will be -- flat 2 groove piston 383 with a 64 cc cylinder head will net with a 250 260 duration cam around 10.2 to 1 -- lift plays no part in the numbers -- but a longer connecting rod will help the flame burn completeness as the piston has a longer dwell time at TDC -- hope that helps -- the picture is a 406 SBC 64 cc head stock short rod and pump gas with too much timing and a heavy foot -- jz
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