What is the horsepower limit for this rotating assembly?

With the standard ARP 8740 cap screws on the connecting rods, this assembly is rated for up to 900 horsepower. Upgrading to optional ARP 2000 cap screws increases the horsepower range to 1,500 HP.

What is the piston dish volume and why does it matter?

The pistons in this assembly have a -20cc dish volume. This specification is important for calculating the engine's final compression ratio when combined with your chosen cylinder heads and head gasket thickness.

Specifications

Brand: Manley Performance
Part #: 28548RHXX
UPC: 807298089546

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-t14-880916
Price: 4019.61 USD
Availability: BackOrder

$4019.61

On Backorder

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

Manley Rotating Assembly, BBC 548 4.250 STROKE/4.530/-20cc. Built with 4340 forged steel for up to 1500 HP.

Key Features

This rotating assembly features a 4340 forged steel crankshaft for strength.
Includes 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, supporting up to 1,500 horsepower.
Comes with 2618 forged aluminum Platinum Series pistons featuring premium chrome moly wrist pins.
The piston dish volume is -20cc, suitable for specific compression ratio targets.
Designed for BBC (Big Block Chevrolet) engines with a 548 cubic inch displacement.

This is a universal engine component. Check manufacturer specifications to confirm compatibility with your specific engine build and vehicle.

⚠️ 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

Secure CheckoutFast Shipping631-982-0042

About this part

Product Details

Starting with a 4340 forged steel crankshaft means this Manley rotating assembly is built for serious power. This BBC 548 package is designed for builders looking to push the limits on their big block engine, offering a 4.250-inch stroke and a 4.530-inch bore with -20cc piston dish. It’s a well-built foundation for a high-performance engine build.

The included 4340 forged steel H-beam connecting rods are robust, coming standard with 7/16-inch ARP 8740 cap screws, capable of handling up to 900 horsepower. If your build demands even more, you have the option to upgrade to ARP 2000 cap screws, which can support up to 1,500 horsepower. Complementing the crank and rods are 2618 forged aluminum Platinum Series pistons. These pistons feature premium chrome moly wrist pins, ensuring durability under high stress and heat. The -20cc dish volume on these pistons is a key specification for achieving specific compression ratios when paired with appropriate cylinder heads.

This rotating assembly is a substantial investment for a high-performance engine project. Please note that this assembly is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's detailed specifications for complete compatibility and installation guidelines.