Manley Rotating Assembly, BBC 555 4.250 STROKE/4.560/-3cc

Starting with a 4340 forged steel crankshaft, this Manley rotating assembly is built to handle serious power for your BBC engine. The 4.250-inch stroke combined with a 4.560-inch bore creates a 555 cubic inch displacement, designed for high-performance builds where strength and reliability are paramount. This isn't just a collection of parts; it's a balanced system engineered to work together under extreme conditions.

The included 4340 forged steel H-beam connecting rods are a robust choice, featuring 7/16-inch ARP 8740 cap screws for a strong connection. For those pushing the limits, there's an option to upgrade to ARP 2000 cap screws, which significantly increases the horsepower range this assembly can safely handle. Complementing the crank and rods are 2618 forged aluminum Platinum Series pistons. These pistons are known for their durability and heat resistance, and they come complete with premium chrome moly wrist pins, ensuring they can withstand the intense pressures and temperatures of a high-output engine.

With the standard ARP 8740 bolts, this assembly is rated for up to 900 horsepower. Opting for the ARP 2000 bolts raises that capability to an impressive 1,500 horsepower, giving you a clear path for significant power gains. It's important to note that this assembly is not CARB approved and cannot be shipped to California. Ensure you check all local regulations before purchasing.