THESE HIGH QUALITY MADE PISTONS ARE FOR STANDARD BORE FOR THESE ONAN ENGINES, P216, P218, P220, BORE 3.250 STANDARD BORE, THESE PISTONS ARE THE SAME WEIGHT AS THE OEM ONAN PISTON. COMPLETE GASKET SET & SEALS. 2 EACH INTAKE & EXHAUST VALVES. 2 INTAKE VALVE SEALS. NOTE: THESE HIGH QUALITY MADE PISTON KITS & VALVES ARE NOT MADE IN TAIWAN OR CHINA. SPECS ON PISTONS, VALVES AND SEALS. 1- BOTTOM END GASKET SET WITH SEALS.