Manley Rotating Assembly, BBC 548 4.250 STROKE/4.530/-20cc

Manley Performance is well-known for making strong internal engine components, and this BBC rotating assembly is a prime example of their commitment to robust parts. If you're building a big block Chevrolet engine aiming for serious power, this assembly is designed to handle the demands. It includes a 4340 forged steel crankshaft with a 4.250-inch stroke, which is the foundation for a 548 cubic inch displacement when paired with the specified pistons and bore size.

The connecting rods are also forged from 4340 steel, featuring an H-beam design for excellent strength-to-weight ratio. They come equipped with 7/16-inch ARP 8740 cap screws, a popular choice for reliability. For those pushing the limits, there's an option to upgrade to ARP 2000 cap screws, which can support even higher horsepower levels. The pistons are made from 2618 forged aluminum, part of Manley's Platinum Series, and include premium chrome moly wrist pins. This combination of materials and design means this assembly is built to withstand significant stress.

With the standard ARP 8740 cap screws, this rotating assembly is rated for up to 900 horsepower. If you opt for the ARP 2000 cap screws, that rating increases to an impressive 1,500 horsepower. This makes it a solid choice for a wide range of performance applications, from street machines to dedicated drag racing engines. Please note that this part is not CARB approved and cannot be shipped to California.