CP Piston BRS BBC 538Ci 4.625 Bore 1.245 Ch 13.8:1 Cr Set Of 8 (MTO Non-Cancel)

These CP Pistons are forged from 2618-T61 aluminum, a strong and lightweight material chosen for high-performance applications where durability under extreme stress is critical. This specific set is designed for BBC (Big Block Chevrolet) 538 cubic inch engines, featuring a 4.625-inch bore size. The pistons are engineered with a 1.245-inch compression height and a dish volume that results in a 13.8:1 compression ratio, making them suitable for naturally aspirated or forced induction builds seeking significant power gains.

Each piston in this set of eight is crafted with precision to ensure consistent performance and reliability. The 2618-T61 aluminum alloy offers excellent thermal expansion properties, which helps maintain proper clearances at operating temperatures, reducing the risk of piston slap and improving overall engine efficiency. The 1.245-inch compression height is a key measurement that dictates the piston's position in the cylinder at Top Dead Center, directly influencing the compression ratio when paired with the correct crankshaft and connecting rod combination.

This set is made to order and is non-cancelable, reflecting the custom nature of high-performance engine components. It's important to note that these pistons are not CARB approved and cannot be shipped to California. For builders aiming for maximum performance from their Big Block Chevrolet engine, these pistons represent a well-built foundation for a powerful and reliable build.