Wiseco K625M855AP HD Forged Piston Kit Mitsubishi Turbo Bore - 1400 4G63 85.5mm 14cc

The Wiseco K625M855AP is a Professional Series 1400 HD forged piston kit engineered for the Mitsubishi 4G63 turbocharged engine. Designed specifically for the first-generation 4G63 6-bolt platform, this kit is built to handle heavy to severe duty performance applications where stock or cast pistons simply won't survive.

Each piston is engineered, forged, and machined in the USA from 2618 high-strength aluminum alloy, offering improved tensile strength and resilience under high-boost, high-heat conditions. The -14cc dish crown helps achieve a suitable compression ratio for turbocharged builds. Wiseco's ArmorGlide® skirt coating reduces friction, resists seizure, and contributes to quieter operation — all critical benefits during break-in and sustained high-performance use.

Kit Includes:

• Heavy-duty .225" wall tool steel wrist pins
• Matching piston ring set with gas nitrided top ring (optimized for turbocharged engines)
• Napier 2nd ring for superior oil control
• Wrist pin locks

Key Features:

• 2618 high-strength aluminum alloy forging
• ArmorGlide® skirt coating — friction reduction, seizure resistance, quieter operation
• Armor Plated crown — abrasion-resistant plating increases ring groove hardness, prevents micro-welding, reduces carbon buildup, and combats detonation-induced corrosion
• Fully machined crown features with precision ring grooves and anti-detonation groove
• Forced pin oiling for improved wrist pin lubrication
• Designed for 88mm stroke crankshaft and 150mm connecting rods
• -14cc dish piston crown
• 85.5mm bore (3.366 in.)
• Made in the USA at Wiseco's Mentor, Ohio facility

The Wiseco K625M855AP is purpose-built for serious engine builders looking to maximize durability and power output from the iconic Mitsubishi 4G63 turbocharged platform. Wiseco's Professional Series represents no-compromise engineering — packed with custom-level performance features and supplied with a complete premium ring package ready for installation.