CP Piston & Ring Set for Mitsubishi 4G64/4G63 2G - Bore (87.0mm)-Size (+0.5mm)-CR (9.0)-Set of 4

What you get in this box is a complete set of four forged pistons and their matching rings, all ready to go into your Mitsubishi 4G64 or 4G63 2nd Gen engine. These aren't just stock replacements; they're built for performance and durability, especially if you're pushing your engine harder than usual. The pistons are forged from high-strength aluminum, which is a lot tougher than cast aluminum you'd find in a standard engine. This means they can handle higher cylinder pressures and temperatures without deforming or failing.

This specific set features an 87.0mm bore size, which is a +0.5mm overbore from the factory specification. This is common when rebuilding an engine, especially if the cylinders have been worn or need to be re-machined. The compression ratio is set at 9.0:1, a solid figure that balances power output with the ability to run on pump gas in many setups. The forged construction also means these pistons are lighter than cast ones, which helps reduce reciprocating mass in the engine, leading to quicker revving and less stress on other rotating components like the crankshaft and connecting rods. The included rings are designed to seal the combustion chamber effectively, ensuring good compression and preventing oil from entering the combustion chamber.

When installing these, remember they are an overbore set, so ensure your engine block has been properly machined to the 87.0mm size. The 9.0:1 compression ratio is a versatile choice, suitable for naturally aspirated builds or those with moderate boost. It's always a good idea to consult with your engine builder or a trusted mechanic to confirm compatibility with your specific build plans and to ensure proper installation procedures are followed. Please note that this part is not CARB approved and cannot be shipped to California.