Wiseco K667M855AP Forged Piston Kit Bore Mitsubishi - HD2 85.5mm 4G63

The Wiseco K667M855AP is an HD2 asymmetrical skirt forged piston and ring kit designed specifically for Mitsubishi 4G63 engines found in EVO 4-9 models, engineered for 100mm stroker crankshafts and 150mm connecting rods. This HD2 piston set is specially designed for high-horsepower builds, with Wiseco reinforcing critical stress points including the pin bore, ring lands, and crown areas that typically fail under extreme power conditions.

Key Features:

• Features Wiseco's asymmetrical skirt and HD2 forging technology
• 85.5mm (3.366") bore diameter with -17.7cc dish design
• Includes thicker wall wrist pins engineered to withstand extreme abuse
• Gas ported design with asymmetric skirt technology
• Armor Plating coating with bronze-tinted finish that increases ring groove durability, prevents micro-welding, reduces carbon buildup, and combats detonation-related corrosion
• Anti-friction skirt coating minimizes scuffing during break-in and reduces cylinder wall friction
• Textured piston crown face improves combustion characteristics

Complete kit includes pistons, piston rings, wrist pins, and circlips for a ready-to-install package. Manufactured from dedicated in-house forgings to deliver lightweight construction with superior strength and optimal design.