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 dish on the pistons is a design feature that helps control the engine's compression ratio. This is critical for tuning performance and ensuring compatibility with your cylinder heads and camshaft selection.

Can this rotating assembly be shipped to California?

No, this part is not CARB approved and cannot be shipped to California due to emissions regulations.

Specifications

Brand: Manley Performance
Part #: 28548H
UPC: 807298079721

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-t14-880910
Price: 3880.68 USD
Availability: BackOrder

$3880.68

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 for high-horsepower BBC builds.

Key Features

This rotating assembly fits BBC engines with a 4.250 inch stroke and 4.530 inch bore.
The crankshaft is forged from 4340 steel for strength and durability.
Includes 4340 forged steel H-beam connecting rods with 7/16-inch ARP 8740 cap screws.
Optional ARP 2000 cap screws are available for the connecting rods, supporting up to 1,500 horsepower.
Features 2618 forged aluminum Platinum Series pistons with premium chrome moly wrist pins.
The pistons have a -20cc dish, designed to achieve specific compression ratios.

This rotating assembly is designed for Big Block Chevrolet (BBC) engines. Check 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

Secure CheckoutFast Shipping631-982-0042

About this part

Product Details

Starting with a 4340 forged steel crankshaft, this Manley rotating assembly is built for serious big-block Chevrolet performance. The 4.250-inch stroke combined with the 4.530-inch bore creates a 548 cubic inch displacement, a popular choice for those looking to build a powerful engine for drag racing or serious street performance.

The H-beam connecting rods are also forged from 4340 steel and come equipped with 7/16-inch ARP 8740 cap screws. If your build demands even more strength, you can opt for ARP 2000 cap screws, which allow this assembly to handle up to 1,500 horsepower. The pistons are Manley's Platinum Series, made from 2618 forged aluminum and include premium chrome moly wrist pins for durability. These pistons feature a -20cc dish, which is crucial for achieving the correct compression ratio with your chosen cylinder heads and camshaft.

This assembly is designed for builders who need a well-built foundation for a high-output engine. Please note that this part is not CARB approved and cannot be shipped to California. Always consult your engine builder and manufacturer's instructions for proper assembly and tuning.