[cadillac_al]

Dude, I hate to be a dick but you can't call yourself a mechanic if you don't know what a piston stop is. That's why I mentioned there aren't many mechanics left anymore. No problem though, that's why everybody is trying to walk you through this basic stuff. You're getting there.

Personally I never needed a piston stop because I don't need to know the exact degree where TDC is. If it's off an inch or more then I can see the problem. This only comes up with mis-matched balancer and timing cover issues (which you may have). I can use a pencil and get it close enough for my needs. If I was actually degreeing a radical cam I would worry more about accuracy.