Wiseco K669M855 Mitsubishi 4G63T Forged Piston Set 85.5mm Bore

The Wiseco K669M855 is a Professional Series forged piston set engineered specifically for Mitsubishi 4G63T engines found in Evolution 4-9 models. This high-performance set features an 85.50mm bore, 28.87mm compression height, and 0.866-inch pin diameter, delivering optimal performance for sport compact applications.

Professional Series Features:

• Engineered, forged, and machined in the USA from 2618 aluminum for improved tensile strength
• ArmorGlide® Skirt Coating provides seizure resistance, friction reduction, and quieter operation
• HD2 Asymmetric Skirt design with gas porting technology
• Dish design with -10.5cc volume for 9.2:1 compression ratio
• Fully machined crown for precision performance
• 22mm wrist pin diameter

Professional Series forged racing pistons from Wiseco are no-expense-spared pistons designed for serious racers and builders, packed full of custom-level performance and durability features. This complete set includes four pistons with premium rings, ready for heavy to severe duty race builds. All machining is done on the newest CNC equipment to ensure the tightest tolerances in the industry.