Manley Rotating Assembly, BBC 555 4.250 STROKE/4.560/+43cc

If you're building a serious big-block Chevrolet engine for serious power, a well-matched rotating assembly is the heart of the operation. This Manley Performance BBC 555 rotating assembly is designed to handle significant output, providing a solid foundation for your high-performance build. It includes a 4.250-inch stroke 4340 forged steel crankshaft, a set of 4340 forged steel H-beam connecting rods, and a set of 2618 forged aluminum pistons.

The 4340 forged steel construction for both the crankshaft and connecting rods means these components are well-built to withstand the stresses of high-RPM operation and increased cylinder pressures. The H-beam design of the connecting rods offers a strong balance of strength and weight. The included Platinum Series pistons are forged from 2618 aluminum, a material known for its durability and thermal expansion properties, and they come with premium chrome moly wrist pins for added strength. This assembly is rated for up to 900 horsepower with the standard ARP 8740 cap screws, and can be upgraded to handle up to 1,500 horsepower with optional ARP 2000 cap screws.

This assembly is intended for competition use and is not CARB approved, meaning it cannot be shipped to California. It's crucial to ensure all components are properly balanced and installed according to manufacturer specifications for optimal performance and longevity. This is a substantial piece for anyone serious about building a powerful BBC engine.