360 build

Pistons are pressed on and you'llchange the balance of the assembly... Dont bother changing them. I've installed a bunch of mass rebuilder engines. Different makes, different sizes, different rebuilders. They all have a few things in common. They are not anywhere near the quality they profess to be. They use teh cheapest parts they cang et, the fastest, chespest machine work they can do, and the assemblers are never that qualified. If you want stock performance for just over the warranty (90 day, 4K miles??? Are you kidding me?) period, or it's something liek that work truck where it's just going to get worked hard, then they are worth the few pennies. At this point I would swap in a smallish cam because the static compression is close to 7.8:1 at max, and run it until it starts to smoke. That's usually what happens first when they get tired.