[blackrosenova400]

Back in the day...?

My Je pistons are slap happy when cold. My ptw is right around .004. They quiet down when they get warm.

Originally Posted by Goat Blower

As I mentioned above, measure the largest piston, bore off of that measurement, the others can only be looser.

Stock pistons don't expand much at all, so being tight isn't much of a concern. Back in the day, JE pistons had a reputation for growing quite a bit because of the material they used, and PtW needed to be really loose to compensate. Needless to say, there was audible piston slap when they were cold.