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Manley Plainum Series Pistons for the 1990-2009 Mitsubishi 2.4 liter, 4G64 motor with 1995-1999 Mitsubishi 4G63 cylinder heads are designed to withstand the high stress and pressures of racing applications. The pistons are machined from high strength 2618 forgings. Each design is lightweight yet robust enough to deliver long service life. Perfect ring groove to skirt squareness is achieved through Manley's unique "one fixturing" manufacturing method that assures maximum horsepower. Round wire locks, tool steel wrist pins, and rings are included with every set at no additional charge. The 86.50mm bore with 8.5:1 compression ratio is best suited for blocks in new condition being used for upgraded turbocharger running medium to high boost levels.