CP Piston & Ring Set Mitsubishi 4G63 2G/Evo 8/9 - Bore 85.5mm - Size +0.5mm - Stroke 94 - CR 8.5/9.0

This package includes a set of four forged pistons and their corresponding rings, specifically made for the Mitsubishi 4G63 engine found in 2nd Gen DSMs and Evo 8/9 models. These pistons are designed to replace your stock ones with an upgraded component, featuring a bore size of 85.5mm and an overbore of +0.5mm, intended for a 94mm stroke. The compression ratio is set at 8.5:1 to 9.0:1, depending on your specific cylinder head volume.

CP Pistons are well-known for their robust construction, and this set is no exception. They are forged from high-strength aluminum alloy, which is a strong material that can handle the increased stresses of a performance engine build. This forging process creates a denser, more durable piston compared to cast aluminum, making them a solid choice for builds aiming for more power or durability. The included rings are also selected to work precisely with these pistons, ensuring proper sealing and oil control within the cylinder. This set is intended for builders who are looking to refresh or upgrade the core of their 4G63 engine, often as part of a larger performance build where reliability under demanding conditions is key.

When installing these pistons, remember they are an overbore size, meaning your engine block will need to be machined to the specified 85.5mm bore. It's always recommended to consult with your machine shop and follow the manufacturer's detailed installation instructions, which will include proper ring gap settings and piston-to-wall clearance for your specific application. This set is not CARB approved and cannot be shipped to California.