Wiseco K625M855 Mitsubishi 4G63 Shelf Stock Piston Kit 85.5mm Bore

The Wiseco K625M855 is a shelf-stock forged piston kit designed for the Mitsubishi 4G63 four-cylinder engine with an 85.5 mm bore. Part of Wiseco's Sport Compact piston lineup, this kit delivers the strength and precision demanded by performance builds, including turbocharged and high-boost applications.

Key Features:

• 2618 High-Strength Forged Aluminum ? Provides superior tensile strength and resistance to heat fatigue compared to cast pistons
• ArmorGlide? Skirt Coating ? Reduces friction, resists seizure, and enables quieter operation under high loads
• 85.5 mm Bore Diameter ? Precision-machined to tight tolerances for consistent sizing and minimal variation
• Fully Machined Crown Features ? Optimized squish and quench geometry for detonation resistance and improved combustion efficiency
• Precision Ring Grooves ? Engineered for reliable ring seal under high compression and power-adder conditions
• Shelf Stock Kit ? Ready to ship without custom lead times; includes pistons, high-quality ring set, wrist pins, and locks
• Engineered and Manufactured in the USA ? Forged and machined at Wiseco's Mentor, Ohio facility

Wiseco's Sport Compact piston kits are purpose-built for performance engines running power adders such as turbochargers, superchargers, and nitrous oxide systems. The advanced forging process and heat-treating procedures deliver the reliability and consistency needed for both street-driven and race builds.