i have a 95 gsr motor that i just got and it has been oversized to 82mm thats what i measured it had been rebuilt and the pistons that were in it had a 0.75 stamped into it i dont know what that is for but maybe someone out there will know from what i can tell i need a .40 oversized piston but how thick of a head gasket do i use please help me out if you know anything it would be a help thanks