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. If you opt for the ARP 2000 cap screws, the rating increases to 1,500 horsepower.

What materials are the crankshaft, rods, and pistons made from?

The crankshaft and connecting rods are constructed from strong 4340 forged steel. The pistons are made from 2618 forged aluminum, part of Manley's Platinum Series, and include premium chrome moly wrist pins.

Specifications

Brand: Manley Performance
Part #: 39565RHX
UPC: 807298086958

Manley Rotating Assembly, BBC 565 4.250 STROKE/4.600/+43cc

Name: Manley Rotating Assembly, BBC 565 4.250 STROKE/4.600/+43cc
Brand: Manley Performance
SKU: manley-performance-manley-rotating-assembly-bbc-565-4-250-stroke-4-600-43cc-t14-881002
Price: 4273.61 USD
Availability: BackOrder

$4273.61

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Manley Rotating Assembly, BBC 565 4.250 STROKE/4.600/+43cc. Built for serious power, handling up to 1500 HP.

Key Features

Fits BBC 565ci engines with a 4.250-inch stroke and 4.600-inch bore.
Features a 4340 forged steel crankshaft for strength and durability.
Includes 4340 forged steel H-beam connecting rods with 7/16-inch ARP 8740 cap screws.
Pistons are 2618 forged aluminum Platinum Series with premium chrome moly wrist pins.
Rated for up to 900 horsepower with standard ARP 8740 cap screws.
Can support up to 1,500 horsepower with optional ARP 2000 cap screws.

This rotating assembly is designed for BBC (Big Block Chevrolet) 565ci engines. Always confirm compatibility with your specific engine build and specifications.

⚠️ 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 for high-horsepower applications, a well-matched rotating assembly is the heart of your build. This Manley Performance rotating assembly is designed for the BBC 565ci platform, featuring a 4.250-inch stroke and 4.600-inch bore with a +43cc piston dish. It's engineered to handle significant power, making it a solid foundation for your performance engine project.

At its core is a robust 4340 forged steel crankshaft, chosen for its strength and durability under extreme stress. Paired with this are 4340 forged steel H-beam connecting rods. These rods come standard with 7/16-inch ARP 8740 cap screws, capable of supporting up to 900 horsepower. For those pushing the limits even further, an option for ARP 2000 cap screws is available, allowing this assembly to reliably handle up to 1,500 horsepower. The pistons are Manley's Platinum Series, made from 2618 forged aluminum for a strong yet lightweight component, and they include premium chrome moly wrist pins for added durability.

This assembly is a critical component for anyone aiming for substantial power gains in their BBC engine. Please note that this part is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper assembly and torque specifications.