Wiseco K668M87 HD2 Forged Piston Kit Mitsubishi 4G63 7-Bolt 87mm Bore

The Wiseco K668M87 is an HD2 Series forged piston kit engineered for high-horsepower Mitsubishi 4G63 7-bolt turbocharged engines. Built for serious performance builders who demand maximum reliability under extreme boost, this kit delivers custom-level durability at a competitive price point.

Wiseco's HD2 design reinforces the areas most vulnerable to failure under high power loads — including the pin bore, ring lands, and piston crown — while incorporating a heavy-duty thick-wall tool steel wrist pin for added strength. The pistons also feature gas porting and an asymmetric skirt profile for improved ring seal and reduced friction under high-horsepower conditions.

Key Features:

• 87mm bore diameter for use with 88mm stroke 4G63 7-bolt applications
• HD2 Series construction — reinforced pin bore, ring lands, and crown for severe-duty builds
• Forged from 2618 high-strength aluminum for superior tensile strength and heat tolerance
• ArmorGlide® skirt coating — reduces friction, minimizes scuffing during break-in, and enables quieter operation
• Gas ported design improves ring seal at high cylinder pressures
• Asymmetric skirt optimizes contact patch and reduces piston rock
• 22mm heavy-duty tool steel wrist pin included
• Matched piston ring set included — gas nitrided top ring for turbo applications, Napier 2nd ring for oil control
• Engineered, forged, and machined in the USA at Wiseco's Mentor, Ohio facility

The K668M87 is purpose-built for high-boost, high-horsepower 4G63 builds where stock or standard aftermarket pistons fall short. Each kit includes the forged pistons, wrist pins, rings, and circlips for a complete top-end rebuild.