Wiseco K675M8525 Forged Piston Kit Mitsubishi Bore CR - 4G63 7-Bolt 85.25mm 9.5 1

The Wiseco K675M8525 is a Professional Series forged piston kit engineered for the Mitsubishi 4G63 7-bolt engine. Featuring an 85.25mm bore (+0.25mm oversize), a -4cc flat top crown, and a 9.5:1 compression ratio, this kit is purpose-built for high-performance turbocharged street and race applications running a standard 88mm stroke with a 156mm connecting rod.

Key Features:

• 85.25mm Bore — +0.25mm oversize for use with a fresh bore or worn cylinder
• 9.5:1 Compression Ratio with -4cc flat top piston crown
• 28.70mm Compression Height — designed for standard 88mm stroke / 156mm rod configuration
• 22mm Pin Diameter — compatible with replacement pin S782
• 2618 Aluminum Forging — engineered and forged in the USA for superior tensile strength and durability under boost
• ArmorGlide® Skirt Coating — reduces friction, minimizes scuffing during break-in, and provides quieter operation
• Armor Plating on Crown & Wrist Pin Bore — abrasion-resistant coating that increases ring groove durability, prevents micro-welding of piston rings, reduces carbon buildup, and combats corrosion from detonation
• Textured Top Face — improves combustion characteristics
• Specially Designed Valve Pockets — multivalve-compatible crown geometry
• Steel Nitride/Napier XX Ring Set — premium rings included (replacement ring set: 8525XX)

Specifications:

• Bore: 85.25mm (+0.25mm oversize)
• Stroke: 88mm (standard)
• Rod Length: 156mm
• Compression Height: 28.70mm
• Pin Diameter: 22mm
• Block Height: 229mm
• Compression Ratio: 9.5:1
• Crown Volume: -4cc (flat top)
• Replacement Pin: S782 | Replacement Rings: 8525XX

Wiseco's Professional Series pistons are manufactured at their Mentor, Ohio facility using cutting-edge forging and CNC machining equipment, making them a trusted choice for serious engine builders tackling heavy to severe-duty race builds.