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

If you're building a serious big-block Chevrolet engine, this Manley rotating assembly is a solid foundation. This kit is designed for a 555 cubic inch displacement, featuring a 4.250-inch stroke crankshaft and pistons with a 4.560-inch bore and +43cc combustion chambers. It's a well-built package aimed at high-performance applications where strength and reliability are paramount.

At the heart of this assembly is a 4340 forged steel crankshaft, chosen for its ability to withstand significant stress. The connecting rods are also made from 4340 forged steel, H-beam style, and come equipped with 7/16-inch ARP 8740 cap screws. For those pushing the limits, there's an option to upgrade to ARP 2000 cap screws, which significantly increases the horsepower handling capability of the assembly. The pistons are forged from 2618 aluminum, part of Manley's Platinum Series, and include premium chrome moly wrist pins for added durability under extreme conditions. This combination is engineered to handle up to 900 horsepower with the standard ARP 8740 bolts, and an impressive 1,500 horsepower when the ARP 2000 bolts are specified.

This rotating assembly is a substantial investment for a performance engine build. It's important to note that this part is not CARB approved and cannot be shipped to California. Ensure you consult with your engine builder to confirm this assembly meets your specific build requirements and local emissions regulations.