Wiseco K627M855AP Forged Piston Kit for Mitsubishi / DSM 4G63

Vehicle Fitment

• 1993-2001 Mitsubishi 4G63 engine (Lancer Evolution I-IX, DSM 7-bolt)

Features

• Forged 2618 aluminum construction for high strength and durability
• Low-friction skirt coating to reduce wear and improve efficiency
• Strutted-forge design for increased rigidity under load
• Dished crown (-21.0 cc) for lower compression ratio
• Precision ring grooves for reliable sealing
• Anti-detonation groove to enhance knock resistance
• Forced pin-oiling for consistent lubrication under high stress
• Includes high-performance piston ring set

Specifications

• Bore: 85.50 mm
• Compression Height: 28.87 mm
• Piston Dish Volume: -21.0 cc
• Compression Ratio: ~8.8:1
• Wrist Pin Diameter: 22 mm
• Piston Material: Forged 2618 aluminum
• Piston Set Quantity: 4 pistons
• Average Piston Weight: ~299 g

Included Components

• 4x forged pistons
• 4x 22 mm wrist pins
• 1x high-performance piston ring set
• Circlips / wrist-pin retainers

Product Description

The Wiseco K627M855AP is a professional forged piston kit designed for Mitsubishi 4G63 engines, including DSM and Lancer Evolution I-IX platforms. These pistons are made from high-strength 2618 aluminum for maximum durability and performance under high RPM and load conditions.

The -21.0 cc dished crown lowers compression ratio (~8.8:1), making this kit ideal for high-boost or race applications. The strutted-forge design improves piston rigidity, while the low-friction skirt coating reduces wear. Forced pin-oiling ensures the 22 mm wrist pins remain well-lubricated during demanding driving.

This kit includes a high-performance ring set and is perfect for track, drift, or high-power street builds. Proper installation - including ring gap verification, clearance checks, and correct torque - is essential for optimum reliability and performance.