What is the horsepower rating for this rotating assembly?

With the standard ARP 8740 cap screws, 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 used in this Manley rotating assembly?

The crankshaft and connecting rods are made from 4340 forged steel. The pistons are 2618 forged aluminum, and premium chrome moly wrist pins are included.

Specifications

Brand: Manley Performance
Part #: 38548RH
UPC: 807298085630

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-t14-880982
Price: 4070.73 USD
Availability: BackOrder

$4070.73

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Manley Rotating Assembly, BBC 548 4.250 STROKE/4.530/-20cc. Handles up to 1500 HP.

Key Features

The crankshaft is constructed from 4340 forged steel for strength.
H-beam connecting rods are also forged from 4340 steel.
Connecting rods include 7/16-inch ARP 8740 cap screws, with an option for ARP 2000.
Pistons are 2618 forged aluminum from Manley's Platinum Series.
Premium chrome moly wrist pins are included with the pistons.
This assembly is rated for up to 900 horsepower with ARP 8740 bolts.

This rotating assembly is designed for BBC (Big Block Chevrolet) engines with a 4.250-inch stroke and a 4.530-inch bore. Check manufacturer specifications for complete compatibility details.

⚠️ 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

Built from 4340 forged steel, the crankshaft in this Manley rotating assembly is designed for serious power. This BBC 548 assembly features a 4.250-inch stroke and is intended for a 4.530-inch bore with -20cc piston dish volume. It's a well-built foundation for a high-performance big block Chevrolet engine.

The connecting rods are also forged from 4340 steel in an H-beam design, ready to handle significant stress. They come equipped with 7/16-inch ARP 8740 cap screws, with an option to upgrade to ARP 2000 fasteners for even greater strength. Complementing the rotating assembly are 2618 forged aluminum pistons from Manley's Platinum Series, which include premium chrome moly wrist pins. This combination is engineered to support substantial horsepower figures.

With the standard ARP 8740 bolts, this assembly is rated for up to 900 horsepower. Opting for the ARP 2000 cap screws raises that capability to an impressive 1,500 horsepower. Please note that this assembly is not CARB approved and cannot be shipped to California. It's a robust choice for builders aiming for significant power output in their big block Chevrolet builds.