Single PistonFits Gm Chevy 4.1L 250 Dish Top Ex LpgSize = .040 OversizedBore Diameter (STD)AlloyTop Ring2nd RingOil RingPin DiameterCompression Height98.43mm (3.875in)Standard5/64in5/64in3/16in0.92731.640Need Rings? To check our inventory, please Click Here for Cast or Click Here for Chrome