yeah, forgot to mention let cool between tanks. Yes heat cycling def. helps as well. I like the idea of pre heating too. Makes since to get the hole as big as possible before tryin to slam the piston up there. I also agree with the idea of putting the piston at bdc after running so that it doesnt get pinched up in the top.

Also, will the EX-Tech be available again soon??? My buddy Team Chambers, my sister, and my dad all run these at our local track, such awesome powerplants, im in the process of regrouping and getting new equipment and really had my heart set on these .24 ex-techs. Tons of grunt down low and really are nice pieces. Don't see them on the net ne where??