CP Piston & Ring Set for Toyota 4AG 20V - Bore (81.5mm) - Size (+0.5mm) - CR (9.0) - Set of 4

This is a set of four forged pistons and rings from CP Pistons, specifically made for the Toyota 4AG 20V engine. These pistons are 81.5mm in bore size and are 0.5mm oversize, intended for an engine rebuild where the cylinders have been bored out to match. With a compression ratio of 9.0:1, they are designed to work well in a variety of performance applications, offering a good balance between power and drivability.

CP Pistons are well-known in the performance engine building community for their robust construction and attention to detail. These pistons are forged from high-strength aluminum alloy, which makes them significantly stronger and more durable than cast pistons. This strength is crucial for handling the increased cylinder pressures and temperatures found in modified or high-performance engines. The set includes the necessary rings, which are also selected to work in harmony with the pistons for optimal sealing and performance. Because these are an oversize set, they are intended for use after the engine block has been machined to the specified bore size, ensuring a proper fit and function.

When rebuilding an engine with these pistons, it's important to ensure all other components are up to spec. This includes proper cylinder wall preparation, correct bearing clearances, and a balanced rotating assembly. Because these are a performance part, it's recommended to consult with your engine builder or refer to CP Pistons' specific installation guidelines to ensure the best results for your build. Please note that this part cannot be shipped to California due to emissions regulations.