What is the horsepower rating for this rotating assembly?

This Manley rotating assembly is rated for up to 900 horsepower when using the included 7/16-inch ARP 8740 cap screws. If you opt for the ARP 2000 cap screws, the assembly is capable of handling up to 1,500 horsepower.

What materials are used in this rotating assembly?

The crankshaft and connecting rods are constructed from strong 4340 forged steel. The pistons are made from 2618 forged aluminum, and the assembly includes Premium Chrome Moly wrist pins for added durability.

Specifications

Brand: Manley Performance
Part #: 38555R
UPC: 807298086576

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-t14-881184
Price: 3888.15 USD
Availability: BackOrder

$3888.15

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/-3cc. Built for high-horsepower BBC builds.

Key Features

Fits Big Block Chevrolet (BBC) engines.
Features a 4.250 inch stroke.
Includes 4340 forged steel crankshaft.
Comes with 4340 forged steel H-beam connecting rods with 7/16" ARP 8740 cap screws.
Equipped with 2618 forged aluminum Platinum Series pistons.
Includes Premium Chrome Moly wrist pins.

This rotating assembly is designed for Big Block Chevrolet (BBC) engines with a 4.560 inch bore and -3cc piston dish. Not CARB approved; cannot ship to California.

⚠️ 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

Secure CheckoutFast Shipping631-982-0042

About this part

Product Details

If you're building a serious big-block Chevrolet engine and need a foundation that can handle serious power, a Manley rotating assembly is a solid choice. This BBC 555 kit is designed for builds aiming for significant horsepower, offering a 4.250-inch stroke with a 4.560-inch bore and -3cc piston dish.

At the heart of this assembly is a 4340 forged steel crankshaft, known for its strength and reliability under high stress. Paired with it are 4340 forged steel H-beam connecting rods. These rods come equipped with 7/16-inch ARP 8740 cap screws, which are rated for up to 900 horsepower. If your build is targeting even higher output, you can opt for ARP 2000 cap screws, pushing the capability to 1,500 horsepower. The pistons are Manley's Platinum Series, made from 2618 forged aluminum for a good balance of strength and light weight, and they include Premium Chrome Moly wrist pins for durability.

This assembly is a critical component for anyone looking to push the limits of their big-block Chevy. Keep in mind 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.