620ci RB, B1 MC heads, cam is .850" lift solid roller, duration 286/306 @ .050", carbureted on gas. Bore 4.600", stroke 4.665", piston 10.3cc dish volume, combustion chamber volume 52cc, head gasket compressed thickness .066", 4.600 bore size".
How much compression ratio would be considered too much? This is a bracket engine, to be raced on a weekly basis. The engine was brought to me with 16.4:1. I can change head gaskets to get it to 15:1 with out doing anything else.
The question is, how much is TOO much?

Thanks, Brian