Manley 03-06 Evo 8/9 (7 Bolt 4G63T) 86mm +1mm 100mm Stroke 8.5:1 Dish Extreme Duty Pistons w/ Rings

Built from domestic 2618 alloy forgings, these Manley Extreme Duty pistons are designed to handle the demands of a high-performance 4G63T engine found in the 2003-2006 Mitsubishi Evolution 8 and 9. The 86mm bore size, combined with a +1mm stroke and a 100mm stroke, results in a specific compression ratio of 8.5:1, achieved through a carefully machined dish in the piston crown. This dish design helps manage combustion temperatures and pressures, making them a solid choice for serious engine builds.

Manley's attention to detail is evident in the exacting standards for ring lands and grooves, which are crucial for achieving a strong seal and maximizing power output. The pistons feature proven cam and barrel skirt profiles, engineered to reduce friction and wear on the cylinder walls while still allowing the engine to make substantial power. Each set includes premium tool steel wrist pins for added durability, and the unique fixturing Manley uses ensures the ring grooves are perfectly square to the piston skirt. This level of precision contributes to overall engine longevity and consistent performance.

These pistons are part of Manley's signature "Platinum Series," a popular choice among professional engine builders and tuners who rely on their strength and performance. Please note that these pistons are not CARB approved and cannot be shipped to California. For a complete build, ensure you have all necessary supporting components and refer to manufacturer instructions for installation details.