Sealed Power E-968K .25MM .25mm Premium Piston 1993-1996 Cadillac 4.6L Northstar V8 1999-2005 Chrsyler 4.7L V8 Bore: 92.989 mm (+.25 mm) Ring Sizes: 1.500 mm, 1.500 mm, 3.000 mm Top Ring: Iron with Moly FacingSecond Ring: Cast IronOil Ring: Chrome Plated Carbon Steel