What is the horsepower rating for this rotating assembly?

With the standard 7/16 inch ARP 8740 cap screws on the connecting rods, this assembly is rated for up to 900 horsepower. An optional upgrade to ARP 2000 cap screws increases the horsepower rating to 1,500.

What materials are used in this Manley rotating assembly?

The crankshaft and connecting rods are made from strong 4340 forged steel. The pistons are forged aluminum from Manley's Platinum Series, and they come with premium chrome moly wrist pins.

Can this rotating assembly be shipped to California?

No, this rotating assembly is not CARB approved and cannot be shipped to California due to emissions regulations.

Specifications

Brand: Manley Performance
Part #: 29555
UPC: 807298075471

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

Name: Manley Rotating Assembly, BBC 555 4.250 STROKE/4.560/+43cc
Brand: Manley Performance
SKU: manley-performance-manley-rotating-assembly-bbc-555-4-250-stroke-4-560-43cc-t14-880919
Price: 3959.53 USD
Availability: BackOrder

$3959.53

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Rotating Assembly, BBC 555 4.250 STROKE/4.560/+43cc. A well-built rotating assembly for high-performance BBC engines.

Key Features

Fits Big Block Chevrolet (BBC) engines.
Features a 4.250 inch stroke and is designed for a 4.560 inch bore with a 43cc chamber volume.
Includes a 4340 forged steel crankshaft for strength and durability.
Comes with 4340 forged steel H-beam connecting rods.
Connecting rods are equipped with 7/16 inch ARP 8740 cap screws, supporting up to 900 horsepower.
Optional ARP 2000 cap screws are available for connecting rods, allowing support for up to 1,500 horsepower.

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

⚠️ 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

If you're building a serious big-block Chevrolet engine, a strong rotating assembly is the heart of the operation. This Manley Performance BBC rotating assembly is designed for builds aiming for significant power, specifically targeting the 555 cubic inch displacement with a 4.250-inch stroke and a 4.560-inch bore. It's a well-built foundation that can handle substantial output, making it a popular choice for performance engine builders.

The core of this assembly features a 4340 forged steel crankshaft, known for its strength and durability under high stress. Paired with this are 4340 forged steel H-beam connecting rods. These rods come standard with 7/16-inch ARP 8740 cap screws, which are rated for up to 900 horsepower. For those pushing the limits even further, there's an option to upgrade to ARP 2000 cap screws, allowing this assembly to support an impressive 1,500 horsepower. The pistons are forged aluminum from Manley's Platinum Series, designed for high performance and durability, and they include premium chrome moly wrist pins.

This assembly is intended for competition use and is not CARB approved, meaning it cannot be shipped to California. When planning your build, consider the horsepower goals and select the appropriate rod cap screw option to ensure the assembly meets your needs. This is a substantial component for a high-performance engine build.