What is the bore size for this rotating assembly?

This Manley rotating assembly is designed for a 4.560-inch bore. It is part of a 555 cubic inch displacement package.

What is the difference between ARP 8740 and ARP 2000 cap screws?

The ARP 8740 cap screws are a strong standard for many performance builds, supporting up to 900 horsepower. Upgrading to ARP 2000 cap screws offers increased tensile strength, allowing the assembly to handle up to 1,500 horsepower.

Does this assembly come with bearings?

This rotating assembly includes the crankshaft, connecting rods, and pistons with wrist pins. Bearings are typically sold separately and should be chosen based on your specific engine block and crankshaft specifications.

Specifications

Brand: Manley Performance
Part #: 28555R
UPC: 807298079769

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-t14-881052
Price: 3808.46 USD
Availability: BackOrder

$3808.46

On Backorder

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

Manley BBC 555 Rotating Assembly with 4.250" stroke. Built for high-horsepower BBC builds up to 1500 HP.

Key Features

Fits Big Block Chevrolet (BBC) engines for a 555 cubic inch displacement.
Includes a 4340 forged steel crankshaft with a 4.250-inch stroke.
Comes with 4340 forged steel H-beam connecting rods featuring 7/16-inch ARP 8740 cap screws.
Optional ARP 2000 cap screws are available for increased horsepower capacity.
Features 2618 forged aluminum Platinum Series pistons with premium chrome moly wrist pins.
Rated for up to 900 horsepower with ARP 8740 bolts.

This rotating assembly is designed for Big Block Chevrolet (BBC) engines. Please consult 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

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 particular kit is designed for a 555 cubic inch displacement, featuring a 4.250-inch stroke crankshaft and a 4.560-inch bore. It's engineered to be a complete package, giving you the core components needed to start assembling your high-performance engine.

At the heart of this assembly is a crankshaft forged from 4340 steel, known for its strength and durability under extreme stress. Complementing the crank are H-beam connecting rods, also made from robust 4340 forged steel. These rods come equipped with 7/16-inch ARP 8740 cap screws, a popular choice for many performance builds. For those pushing the limits even further, there's an option to upgrade to ARP 2000 cap screws, which significantly increases the horsepower handling capability of the assembly.

The pistons in this kit are Manley's Platinum Series, forged from 2618 aluminum. This material is chosen for its excellent thermal properties and strength, crucial for high-compression, high-heat environments. They come complete with premium chrome moly wrist pins, ensuring reliable operation of the piston and connecting rod connection. With the standard ARP 8740 bolts, this assembly is rated for up to 900 horsepower, and with the optional ARP 2000 bolts, it's capable of handling an impressive 1,500 horsepower. This makes it a versatile option for everything from a powerful street engine to a dedicated race application.