Wiseco 6666M86AP Professional Series Forged Piston 86.00mm Bore Mitsubishi 4G63

The Wiseco 6666M86AP is a Professional Series forged racing piston engineered for the Mitsubishi 4G63 engine at an 86.00mm bore. Designed for serious engine builders and racers, this piston delivers custom-level performance and durability straight out of the box.

Wiseco's Professional Series represents their top-tier automotive piston line — no-expense-spared components built for heavy to severe-duty race applications. Each piston is engineered, forged, and machined in the USA from 2618 aluminum alloy, a material prized for its superior tensile strength and fatigue resistance under high-heat, high-boost conditions.

Key Features:

• 2618 Forged Aluminum Construction — improved tensile strength and thermal fatigue resistance vs. cast pistons
• ArmorGlide® Skirt Coating — seizure-resistant, friction-reducing coating for quieter operation and extended engine life
• 86.00mm Bore Diameter — precision-machined to tight tolerances for consistent fit
• Professional Series (AP) — Wiseco's premium line built for heavy to severe-duty race builds
• CNC Diamond-Turned Finish — ensures zero size variation and a perfect bore fit
• USA Engineered and Manufactured — produced at Wiseco's state-of-the-art domestic facility
• Includes premium ring set

The 6666M86AP is part of Wiseco's Sport Compact / Euro Sport Compact piston lineup, purpose-built for the demands of forced-induction and high-performance naturally aspirated 4G63 engine builds. Whether building for the strip or road course, this piston provides the reliability and precision required for serious performance applications.