The piston is heat treated with a T-5 hardening and tempering cycleThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston lifeGravity-cast aluminum alloy (not forged) with 18% silicone contentCast OE replacement pistonTop end kit includes piston, rings, pins, circlips, top end gaskets, and wrist pin bearing