Thread: compression issues

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the actual head cc is 63.0 measured three times this afternoon.
the piston was measured in the bore to account for dome, valve reliefs and deck height.

I would say if you have any doubts that it won't run on pump gas then go with the 76cc combustion chambers.

I think he is right on the edge for pump gas ,maybe it will run on it with the timing real low or some octane boost ,maybe it wont
The 76 ers would be much better in my opinion,you could back off that abdc number and use more of the stroke of the engine.
I went over board on trying to utilize the entire stroke on my application,I think it was almost a good 3 inches of the 3.48.