What is the horsepower rating for this rotating assembly?

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

What specific engine configuration does this assembly fit?

This rotating assembly is designed for Big Block Chevrolet (BBC) engines with a 555 cubic inch displacement, a 4.250-inch stroke, and a 4.560-inch bore. The pistons have a +43cc dish.

Are there any restrictions on shipping this product?

Yes, this assembly is not CARB approved and therefore cannot be shipped to California due to emissions regulations.

Specifications

Brand: Manley Performance
Part #: 39555H
UPC: 807298086804

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-t14-880988
Price: 4152.46 USD
Availability: BackOrder

$4152.46

On Backorder

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Manley Rotating Assembly, BBC 555 4.250 STROKE/4.560/+43cc. Handles up to 1500 HP.

Key Features

Fits BBC (Big Block Chevrolet) engines with a 555 cubic inch displacement.
Features a 4.250-inch stroke crankshaft and a 4.560-inch bore with +43cc dish pistons.
Includes a 4340 forged steel crankshaft for strength and durability.
Comes with 4340 forged steel H-beam connecting rods with 7/16? ARP 8740 cap screws.
Optional ARP 2000 cap screws are available for the connecting rods, increasing horsepower capability.
Pistons are 2618 forged aluminum Platinum Series with Premium Chrome Moly wrist pins.

This rotating assembly is designed for BBC (Big Block Chevrolet) engines. It is not CARB approved and cannot be shipped 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

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About this part

Product Details

If you're building a serious BBC (Big Block Chevrolet) engine, this Manley rotating assembly is a solid foundation. It's designed for a 555 cubic inch displacement with a 4.250-inch stroke and a 4.560-inch bore, featuring a +43cc piston dish. This kit gives you all the core components to build a powerful engine that can handle significant output.

At the heart of this assembly is a 4340 forged steel crankshaft, chosen for its strength and durability under high stress. Paired with it are 4340 forged steel H-beam connecting rods. These rods come standard with 7/16? ARP 8740 cap screws, which are rated for up to 900 horsepower. If your build aims higher, you can opt for ARP 2000 cap screws, pushing the horsepower capability up to 1,500. 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.

This is a well-built assembly intended for high-performance applications. Keep in mind that this assembly is not CARB approved and cannot be shipped to California. For builds targeting serious power, this Manley rotating assembly offers the robust components needed to achieve your goals.