Just when I thought i was getting ahead on my blaster adventure, the engine shop called....my piston is too small...the sleeve was 67.20 when I measured, I bought 67.5 thinking that would be more then enough...he said we need to go 68 to be sure it's clean of shadowing... So I went to try to return the piston, and they are no returns since its special order... So now I have a brand new still in box wiseco 67.5mm piston....trying to decide if its cheaper to find a top end that can take this piston or buy a new piston, and leave only 1 bore I believe....