CP Piston & Ring Set for Mitsubishi 4G64 Evo 8/9 Head - 87.00mm Bore +0.5mm Size 88 Stroke Set of 4

This set includes four forged pistons and their corresponding ring sets, designed for the Mitsubishi 4G64 engine found in Evo 8 and 9 models. These pistons are built to a specific bore size of 87.00mm, which is a +0.5mm overbore from the stock dimension, and are intended for an 88mm stroke.

Forged pistons are a strong choice for performance applications because they are made from a solid block of aluminum that is heated and hammered into shape. This process creates a denser, more durable grain structure compared to cast pistons, making them more resistant to the high pressures and temperatures found in modified or performance engines. The +0.5mm overbore is a common size when rebuilding an engine to restore cylinder wall integrity or to achieve a slight increase in displacement. The included ring sets are essential for proper sealing between the piston and cylinder wall, which is critical for compression and oil control.

When rebuilding an engine, it's important to ensure all components are clean and properly lubricated before installation. Always refer to the manufacturer's installation instructions for specific details regarding assembly and break-in procedures.