What is the horsepower rating for this rotating assembly?

This Manley rotating assembly is rated for up to 900 horsepower with the standard 7/16-inch ARP 8740 cap screws on the connecting rods. If you opt for the ARP 2000 cap screws, the assembly can support up to 1,500 horsepower.

What specific engine configuration does this assembly fit?

This assembly is designed for Big Block Chevrolet (BBC) engines. It is configured for a 548 cubic inch displacement, a 4.530 inch bore, and a 4.250 inch stroke.

Are there any shipping restrictions for this part?

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

Specifications

Brand: Manley Performance
Part #: 38548RX
UPC: 807298085661

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-t14-880985
Price: 3975.28 USD
Availability: BackOrder

$3975.28

On Backorder

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

Manley Performance BBC 548 rotating assembly with 4.250" stroke. Supports up to 1500 HP.

Key Features

Fits BBC 548 cubic inch engines with a 4.530 inch bore and 4.250 inch stroke.
Includes a 4340 forged steel crankshaft for strength and durability.
Comes with 4340 forged steel H-beam connecting rods featuring 7/16? ARP 8740 cap screws.
Optional ARP 2000 cap screws are available for increased connecting rod strength.
Features 2618 forged aluminum Platinum Series pistons with premium chrome moly wrist pins.
Rated for 900 horsepower with ARP 8740 bolts and up to 1,500 horsepower with optional ARP 2000 bolts.

This rotating assembly is designed for Big Block Chevrolet (BBC) engines with a 548 cubic inch displacement, a 4.530 inch bore, and a 4.250 inch stroke. It is not CARB approved and cannot ship 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

Manley Performance is well-known for making strong internal engine components, and this BBC 548 rotating assembly is a prime example of their commitment to building parts that can handle serious power. If you're putting together a big block Chevrolet engine for high-performance use, this assembly gives you the core pieces needed to build a robust powerplant. It's designed for a 4.530-inch bore and features a 4.250-inch stroke, which contributes to the 548 cubic inch displacement.

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-inch ARP 8740 cap screws, but you have the option to upgrade to ARP 2000 cap screws for even more strength. The pistons are Manley's Platinum Series, made from 2618 forged aluminum and include premium chrome moly wrist pins. This combination of forged materials is key to handling the demands of a high-output engine.

This rotating assembly is rated for up to 900 horsepower when using the standard ARP 8740 bolts. If you plan to push your engine harder, upgrading to the ARP 2000 cap screws allows this assembly to support up to 1,500 horsepower. Keep in mind that this part is not CARB approved and cannot be shipped to California. It's a solid foundation for a powerful engine build, but always refer to manufacturer instructions for proper installation and any additional components needed.