Wiseco K666M855AP Forged Pistons for 1993-01 Mitsubishi 4G63 7-Bolt

Vehicle Fitment

• 1993-2001 Mitsubishi Eclipse / Talon / Laser (4G63, 7-Bolt)
• 1996-2006 Mitsubishi Lancer Evolution IV-IX (4G63, 7-Bolt)

Features

• Forged from 2618 aluminum alloy for high strength and durability
• ArmorGlide® skirt coating reduces friction and piston noise
• Dished crown (-4.5 cc) for controlled compression (~9.63:1)
• Strutted forging enhances piston rigidity under high load
• Forced-pin oiling ensures reliable wrist pin lubrication
• Precision ring grooves with anti-detonation design
• Armor-plated (AP) ring lands for increased durability
• Includes high-performance steel ring set

Specifications

• Bore: 85.50 mm
• Stroke: 88.00 mm
• Compression Height: 35.00 mm
• Dome / Dish Volume: -4.5 cc
• Compression Ratio: ~9.63:1
• Wrist Pin Diameter: 22 mm
• Piston Weight: ~360 g
• Ring Set: Steel included

Included Components

• 4x Forged pistons
• 4x Wrist pins (22 mm)
• 4x Retaining clips
• 1x Steel ring set

Product Description

The Wiseco K666M855AP piston kit is engineered for Mitsubishi 4G63 7-bolt engines, including DSM and early Evo models. These forged pistons offer high strength and reliability, ideal for high-performance and turbocharged applications.

Featuring a -4.5 cc dished crown, the pistons maintain moderate compression suitable for both naturally aspirated and forced-induction builds. The strutted forging design increases rigidity, while forced-pin oiling ensures proper lubrication at the wrist pins during high RPM operation.

The armor-plated (AP) ring lands improve durability under high load. The kit includes pistons, wrist pins, clips, and a steel ring set, providing a complete solution for performance engine rebuilds on 4G63 platforms.