Hypereutectic Piston 4.00" Bore 0.75mm Oversize

The Sealed Power H655CP75MM is a hypereutectic piston engineered for Mopar engines, offering enhanced durability and strength due to its aluminum alloy with 16 percent silicon content. This piston is designed with a 4.0295-inch (102.349mm) bore and an oversize of 0.75mm, making it suitable for engines requiring this specific size adjustment. Key specifications include a compression distance of 1.612 inches and an oval dish piston top with a dome volume of -11.23cc. The piston features a three-ring design with specific ring thicknesses: 1.50mm for the top and second compression rings, and 4.00mm for the oil ring. The included wrist pin has a diameter of 0.984 inches. This piston also incorporates features aimed at improving performance and longevity. It has a DUROSHIELD® coated piston skirt and a moly-graphite coating that helps extend engine life. Additionally, the design helps improve cylinder sealing to minimize blow-by and retains standard ring gaps in the top groove.