I'm trying to build an all motor LS for my 89 Hatchback. I got the P30 pistons and had them dropped off at the machine shop to remove the pistons. But they said heating the pins to press them out would probably crack the piston itself. Is this common or is there any other way to remove the piston than by using heat? Also if I have to buy new pistons what year model exactly am I looking for and are the PR3's the same as P30's?