Thread: need some piston help

Tweet

hmm can anyone give me a power estimate with the flat tops which worked out to be around a 9.3:1 CR
and thanks guys

im also worried about piston to valve clearance. the domes of the pistons stick out of the block at TDC and my heads have 64cc chambers. at what size will domes interfere with the valves??

Originally Posted by muteboy49

im also worried about piston to valve clearance. the domes of the pistons stick out of the block at TDC and my heads have 64cc chambers. at what size will domes interfere with the valves??

Sorry, there is no standard answer, too many variables. You'll have to measure everything before it is assembled. Now you know why engine builders get the big money.

Speed Freak is talking aluminum heads and EFI together with some close squish and good spark management.

yeah i knew 10.5:1 CR is kinda high to run on pump gas. im thinking of getting the heads milled or finding better ones and running the flat tops strictly because i really dont feel like buying race gas (well all the time anyways)
i dont need a killer motor. just something to run decent numbers and to have something for the kids around here in their probes and civics and all those other little sh*tboxes

Unless you are running a power adder that 10.5:1 is fine on pump gas I would use premium gas but now I can see were you might run in to piston to valve clearnce and I could not tell if you are or not like Tech said to many variables if in doubt always check!

yeah ill have to check it. however i seriously believe they will make contact