What horsepower levels can this rotating assembly handle?

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

What specific components are included in this Manley rotating assembly?

This kit includes a 4340 forged steel crankshaft, 4340 forged steel H-beam connecting rods with 7/16-inch ARP 8740 cap screws, and 2618 forged aluminum Platinum Series pistons with premium chrome moly wrist pins.

Specifications

Brand: Manley Performance
Part #: 38555RH
UPC: 807298086583

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-t14-881185
Price: 4001.40 USD
Availability: BackOrder

$4001.40

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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/-3cc. Includes forged steel crankshaft, H-beam connecting rods, and forged aluminum pistons.

Key Features

This kit includes a 4340 forged steel crankshaft, 4340 forged steel H-beam connecting rods, and 2618 forged aluminum Platinum Series pistons.
The connecting rods come with 7/16-inch ARP 8740 cap screws, supporting up to 900 horsepower.
Optional ARP 2000 cap screws are available for the connecting rods, increasing the horsepower range to 1,500.
The pistons are forged aluminum with premium chrome moly wrist pins.
This assembly is designed for a BBC 555 cubic inch engine with a 4.250-inch stroke and a 4.560-inch bore.
The pistons feature a -3cc dish.

This rotating assembly is designed for 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

When you're building a serious BBC engine, a strong rotating assembly is the heart of the operation. This Manley Performance rotating assembly is designed for the 555 cubic inch displacement, featuring a 4.250-inch stroke and a 4.560-inch bore with a -3cc piston dish. What you get in this kit is a 4340 forged steel crankshaft, which is a solid foundation for high-performance builds. It also includes 4340 forged steel H-beam connecting rods, known for their strength and reliability under stress. Topping it off are 2618 forged aluminum Platinum Series pistons, complete with premium chrome moly wrist pins.

This assembly is built to handle significant power. With the standard 7/16-inch ARP 8740 cap screws on the connecting rods, it's rated for up to 900 horsepower. If you're looking to push the limits further, you can opt for ARP 2000 cap screws, which will support up to 1,500 horsepower. The forged construction of all the major components—crankshaft, rods, and pistons—means they can withstand the intense pressures and heat generated in a high-performance engine. This is a well-built package for anyone serious about maximizing their BBC's potential.

Please note that this assembly is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper assembly and torque specifications.