Wiseco Mitsubishi 4G63 85.00 mm Bore 34.87 mm CH -9.00 CC Piston Set

The Wiseco K666M85 is a professional series forged racing piston set designed for serious racers and builders using the Mitsubishi 4G63 engine. These pistons are engineered, forged, and machined in the USA from 2618 aluminum for improved tensile strength, capable of withstanding heavy to severe duty race builds.

Key technical specifications include an 85.00 mm bore, a compression height (CH) of 34.87 mm, and a -9.00 CC dome volume. The piston set features ArmorGlide™ Skirt Coating, which provides seizure resistance, reduces friction, and promotes quieter operation. Additionally, these pistons boast a fully machined crown, precision ring grooves, an anti-detonation groove, and forced pin oiling.

Installation typically requires professional engine building experience. It is crucial to ensure proper bore sizing and ring gap to achieve optimal performance and longevity. These pistons are designed to replace factory components and may require specific tools for installation.

This piston set is specifically designed for the Mitsubishi 4G63 engine, commonly found in various Mitsubishi Lancer Evolution models from 1992-2007. It is vital to confirm engine code compatibility as fitment is tied directly to the 4G63 engine rather than specific vehicle trims or submodels beyond the engine application. It is not compatible with Lancer Evolution models equipped with the 4B11T engine (e.g., Evo X).