What is the horsepower rating for this rotating assembly?

This Manley rotating assembly is rated for up to 900 horsepower when using the standard ARP 8740 cap screws on the connecting rods. With the optional ARP 2000 cap screws, the assembly can support up to 1,500 horsepower.

What materials are used in this rotating assembly?

The crankshaft and connecting rods are constructed from 4340 forged steel for strength. The pistons are made from 2618 forged aluminum and include Premium Chrome Moly wrist pins.

Specifications

Brand: Manley Performance
Part #: 28555H
UPC: 807298079752

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

Name: Manley Rotating Assembly, BBC 555 4.250 STROKE/4.560/-3cc
Brand: Manley Performance
SKU: manley-performance-manley-rotating-assembly-bbc-555-4-250-stroke-4-560-3cc-t14-881049
Price: 3811.34 USD
Availability: BackOrder

$3811.34

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Manley Rotating Assembly, BBC 555 4.250 STROKE/4.560/-3cc. Built for high-horsepower BBC builds.

Key Features

This rotating assembly includes a 4340 forged steel crankshaft.
It comes with 4340 forged steel H-beam connecting rods fitted with 7/16? ARP 8740 cap screws.
Optional ARP 2000 cap screws are available for the connecting rods, increasing horsepower capacity.
The assembly features 2618 forged aluminum Platinum Series pistons with Premium Chrome Moly wrist pins.
This rotating assembly is rated for up to 900 horsepower with ARP 8740 bolts and up to 1,500 horsepower with optional ARP 2000 bolts.
The BBC 555 assembly has a 4.250-inch stroke and a 4.560-inch bore with a -3cc piston dish.

This rotating assembly is designed for Big Block Chevrolet (BBC) engines. Check manufacturer specifications to confirm compatibility with your specific engine build.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

The 4340 forged steel crankshaft is the heart of this Manley rotating assembly, built to handle serious power. This BBC (Big Block Chevrolet) 555 cubic inch assembly features a 4.250-inch stroke and a 4.560-inch bore with a -3cc piston dish, designed for performance builds where strength and reliability are paramount. It’s a well-built foundation for engines aiming for significant horsepower figures.

Complementing the robust crankshaft are the 4340 forged steel H-beam connecting rods. These rods come standard with 7/16-inch ARP 8740 cap screws, capable of supporting up to 900 horsepower. For those pushing the limits further, an option for ARP 2000 cap screws is available, allowing this assembly to handle up to 1,500 horsepower. The included 2618 forged aluminum Platinum Series pistons are lightweight yet strong, featuring Premium Chrome Moly wrist pins for added durability under stress.

This rotating assembly is a popular choice for engine builders looking to create a powerful and dependable Big Block Chevrolet. It’s important to note that this assembly is not CARB approved and cannot be shipped to California. Always consult the manufacturer's specifications for complete build details and recommended installation procedures.