CP Piston & Ring Set Mitsubishi 4G64/4G63 2G - Bore (87.5mm)-Size (+1mm)-CR (9.5)-Set of 4

This is a set of four forged pistons and rings from CP Pistons, specifically made for Mitsubishi 4G64 and 4G63 2G engines. These pistons are designed to be 87.5mm in bore diameter, which is a +1mm oversize from the factory specification. They feature a 9.5:1 compression ratio, making them a solid choice for rebuilding or upgrading your engine's top end.

CP Pistons are well-known in performance circles for their robust construction. These are forged from high-strength aluminum alloy, which is much stronger and more durable than cast aluminum typically found in stock pistons. This strength is crucial for handling the increased cylinder pressures and temperatures that come with performance modifications or even just a fresh rebuild. The +1mm oversize bore means these are intended for engines that have already been bored out to accommodate this size, often done to clean up cylinder walls or achieve a specific displacement. The 9.5:1 compression ratio is a good balance, offering a noticeable improvement in power over stock while still being manageable with pump gasoline in many setups.

This set includes the pistons and the necessary rings to match. When installing these, it's important to ensure your cylinder walls are properly honed to the correct finish for these oversized pistons and that all clearances are checked according to the manufacturer's specifications. Because these are a performance part and are oversized, professional installation is highly recommended to ensure proper engine function and longevity. Please note that this part is not CARB approved and cannot be shipped to California.