What should the piston to block bore clearance be on a race motor? Pistons are Speed Pro Hypereutectic 4.35

Should say in the instructions .0035 is my guess.
Think they say .0015 minimum but that is too tight for me!!!

Go with what Speed pro recommends for thoe pistons in your application Speed Pro has spent millions of dollars over the years doing research and development on those pistons I think that all of the OEM gas engines made in the USA have hypereutuctic in them now from the factory exept maybe the hi output turbo and supercharged motors, maybe even them