Wiseco Mitsubishi 4G63 85.00 mm Bore 28.70 mm CH -12.00 CC Piston Set

Professional Series forged racing pistons from Wiseco are designed for serious racers and builders, offering superior performance and durability. This K674M85 piston set is engineered for the Mitsubishi 4G63 engine with an 85.00 mm bore. These pistons feature a 28.70 mm compression height and a -12.00 CC dome volume, optimized for high-stress racing applications. Each set includes premium rings and is built to withstand heavy to severe duty race conditions.

Key technical specifications include an 85.00mm bore, 28.70mm compression height, and 0.8661-inch pin diameter. The pistons are made from high-quality forged aluminum for excellent strength-to-weight ratio and heat resistance, crucial for turbocharged or high-RPM engines. These are a set of four pistons.

Installation of piston sets requires significant engine disassembly and specialized tools. It is recommended for experienced mechanics or professional engine builders. Factory connecting rods and crankshaft may be reused if they are within specifications, but aftermarket components are often paired with these pistons for optimal performance. Proper cylinder honing and ring gap setting are critical for performance and longevity.

This piston set is specifically designed for the Mitsubishi 4G63 engine, found in various models including the 1990-1999 Mitsubishi Eclipse and Mitsubishi Lancer Evolution I-IX. It is crucial to verify your engine's exact specifications, especially bore size, before purchase to ensure proper fitment. This product does not fit engines outside the 4G63 family or those with different bore sizes.