What is the horsepower rating for this rotating assembly?

With the standard 7/16-inch 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 is the purpose of the -20cc piston dish?

The -20cc dish on the pistons is a volume specification that affects your engine's final compression ratio. When combined with your chosen cylinder heads and head gasket thickness, it helps determine how much air-fuel mixture is compressed in the cylinder.

What other components are typically needed when installing a rotating assembly?

When installing a rotating assembly, you'll generally need a complete engine gasket set, piston rings (if not included with pistons), bearings (main and rod), oil pump and pickup, timing set, and potentially a new oil pan and windage tray. It's also crucial to ensure your engine block is properly machined and clearanced.

Specifications

Brand: Manley Performance
Part #: 28548X
UPC: 807298089560

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-t14-880918
Price: 3785.23 USD
Availability: BackOrder

$3785.23

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. Built for high-horsepower BBC builds with 4.250" stroke.

Key Features

Fits Big Block Chevrolet (BBC) engines.
Features a 4340 forged steel crankshaft for strength and durability.
Includes 4340 forged steel H-beam connecting rods with 7/16" ARP 8740 cap screws.
Optional ARP 2000 cap screws are available for increased horsepower capacity.
2618 forged aluminum Platinum Series pistons are included.
Comes with Premium Chrome Moly wrist pins.

This rotating assembly is designed for Big Block Chevrolet (BBC) engines with a 548 cubic inch displacement, 4.250-inch stroke, and pistons with a -20cc dish. It is not CARB approved and cannot be shipped 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

If you're building a serious big block Chevrolet engine and aiming for significant horsepower, a robust rotating assembly is the heart of the operation. This Manley Performance rotating assembly is designed for those who demand strength and reliability for their BBC 548ci build, featuring a 4.250-inch stroke.

At its core is a 4340 forged steel crankshaft, chosen for its exceptional strength and durability under high stress. Complementing the crank are 4340 forged steel H-beam connecting rods. These rods come standard with 7/16-inch ARP 8740 cap screws, a solid choice for builds up to 900 horsepower. For those pushing the limits further, optional ARP 2000 cap screws are available, allowing this assembly to handle up to 1,500 horsepower.

The pistons are Manley's 2618 forged aluminum Platinum Series, paired with Premium Chrome Moly wrist pins. This combination ensures lightweight strength and excellent thermal stability, crucial for managing the heat and pressures of a high-performance engine. The pistons are designed with a -20cc dish, which will factor into your final compression ratio depending on your cylinder head volume. Please note that this assembly is not CARB approved and cannot be shipped to California. It's essential to consider your entire engine combination, including cylinder heads and camshaft, to achieve your desired performance goals.