i dont know my cc's in my heads. they are uncut so im thinking 90+ cc's so i might have 9.7CR now. the engine is a running,hyd cam combo now that needs some updating. im trying to go faster on a super budget. what if i had a shim headgasket wouldnt that get my CR up? also can deck the block and heads. with the 590 whats the CR limit for pump fuel (93octane)? thanks!