Supertech Mitsubishi 4G63 85.5mm Bore -9.5cc Dish 9:1 CR Pistons - Set of 4 (Fits +2mm Valves)

Supertech Pistons are manufactured from extruded high silicone, enhanced 4032 alloy (with additional Cu, Ni & Mg) that has low thermal expansion, excellent wear resistance, and higher thermal conductivity. These pistons have withstood up to 42psi of boost with alcohol without problems. A two or three-step forging process yields a fine structural grain, which is then submitted to several machining steps in state-of-the-art CNC machines. Several heat treatments provide the piston with high tensile strength and evenly distributed hardness. Contact reduction grooves are standard, and pin bores are honed and reamed for precise fit. Wrist pins are constructed of cold-extruded chrome moly steel for high strength and used with wire clip locks. Finally, the pistons receive a 'phosphate dry lubricant' coating to protect the rings against 'micro-welding' and enhance lubrication on the skirt/cylinder area.