Single PistonFits Ford 4.7L 289 5.0L 302 Flat Top 4BblSize = .040 OversizedBore Diameter (STD)AlloyTop Ring2nd RingOil RingPin DiameterCompression Height101.60mm (4.000in)Standard5/64in5/64in3/16in0.91221.585Need Rings? To check our inventory, please Click Here for Cast or Click Here for Moly