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 is the purpose of the -20cc piston dish?

The -20cc piston dish is a volume measurement that affects your engine's final compression ratio. A dished piston generally lowers compression, which can be beneficial for forced induction applications or to achieve a specific compression target with certain cylinder heads.

Specifications

Brand: Manley Performance
Part #: 38548H
UPC: 807298085593

Manley Rotating Assembly, BBC 548 4.250 STROKE/4.530/-20cc

Name: Manley Rotating Assembly, BBC 548 4.250 STROKE/4.530/-20cc
Brand: Manley Performance
SKU: manley-performance-manley-rotating-assembly-bbc-548-4-250-stroke-4-530-20cc-t14-880978
Price: 3960.37 USD
Availability: BackOrder

$3960.37

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Manley Rotating Assembly, BBC 548 4.250 STROKE/4.530/-20cc. Built for high-horsepower BBC builds.

Key Features

This rotating assembly fits Big Block Chevrolet (BBC) engines and features a 4.250 inch stroke.
The crankshaft is constructed from 4340 forged steel for maximum strength and durability.
Included are 4340 forged steel H-beam connecting rods, equipped with 7/16-inch ARP 8740 cap screws.
These rods can support up to 900 horsepower with the standard ARP 8740 fasteners.
Optional ARP 2000 cap screws are available for the connecting rods, increasing the horsepower capacity to 1,500 HP.
The kit includes 2618 forged aluminum Platinum Series pistons with premium chrome moly wrist pins.

This rotating assembly is designed for Big Block Chevrolet (BBC) engines. Please consult with a professional or refer to 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 aiming for significant horsepower, a robust rotating assembly is the heart of your build. This Manley Performance rotating assembly is designed for those who demand strength and reliability under extreme conditions. It includes a 4340 forged steel crankshaft with a 4.250-inch stroke, paired with 4340 forged steel H-beam connecting rods. These rods come standard with 7/16-inch ARP 8740 cap screws, offering a horsepower range up to 900 HP. For those pushing the limits even further, optional ARP 2000 cap screws are available, allowing this assembly to handle up to 1,500 HP.

The pistons in this kit are Manley's Platinum Series, crafted from 2618 forged aluminum for strength and lightness, and they include premium chrome moly wrist pins. The piston dish is -20cc, which will contribute to your final compression ratio depending on your cylinder head volume. This assembly is a well-built foundation for a high-performance BBC engine, whether it's destined for the drag strip, a street/strip car, or serious performance street use. Remember that this assembly is not CARB approved and cannot be shipped to California.