[gtofreek]

Also, Pistons come in different radial depth's on the ring grooves. It is important to have rings with the proper radial depth for the piston. The radial depth is how deep the ring groove is. The groove should be about .005" deeper than the ring. I stick the ring in the groove, upside down, and make sure it goes completely into the piston and does not stick out. If it sticks out, you will ruin the cylinders and pistons as soon as the engine warms up. You don't want a lot of radial clearance either, as this reduces the pressure on the backside of the ring to keep it sealing. If your rings are 1/16"x1/16"x3/16" You probably won't have an issue with this as most, if not all 1/16" rings are made with a standard radial depth. Other ring sizes can vary a lot in depth.

This should ALWAYS be checked when assembling an engine.