What is the horsepower rating for this rotating assembly?

With the included 7/16? ARP 8740 cap screws, this assembly is rated for up to 900 horsepower. If you upgrade to optional 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 helps to control the engine's compression ratio. This is crucial for tuning performance and ensuring compatibility with your chosen cylinder heads and camshaft.

Does this rotating assembly come balanced?

Rotating assemblies typically require balancing by a professional engine builder to ensure optimal performance and longevity. It is recommended to consult with your engine builder or refer to Manley's technical documentation for specific balancing procedures.

Specifications

Brand: Manley Performance
Part #: 28548RX
UPC: 807298089553

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-t14-880917
Price: 3895.59 USD
Availability: BackOrder

$3895.59

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

Verified fitment for BBC 548 cubic inch engines with a 4.250 inch stroke.
Includes a 4340 forged steel crankshaft for strength and durability.
Features 4340 forged steel H-beam connecting rods with 7/16? ARP 8740 cap screws.
Comes with 2618 forged aluminum Platinum Series pistons and Premium Chrome Moly wrist pins.
Rated for up to 900 horsepower with standard ARP 8740 cap screws.
Capable of handling up to 1,500 horsepower when using optional ARP 2000 cap screws.

This rotating assembly is designed for BBC (Big Block Chevrolet) 548 cubic inch engines with a 4.250 inch stroke and 4.530 inch bore. Not CARB approved; 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 rotating assembly is a prime example of their commitment to performance. If you're building a big block Chevrolet engine and need a robust foundation, this assembly is designed to handle serious power. It includes a 4340 forged steel crankshaft with a 4.250-inch stroke, paired with 4340 forged steel H-beam connecting rods. These rods come ready for 7/16-inch ARP 8740 cap screws, with an option to upgrade to ARP 2000 screws for even more strength.

The pistons in this kit are Manley's Platinum Series, made from 2618 forged aluminum and include Premium Chrome Moly wrist pins. This combination of materials and construction is chosen for its ability to withstand the stresses of high-performance engines. 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 assembly is capable of handling up to 1,500 horsepower, giving you a clear upgrade path for more extreme builds. The pistons are also designed with a -20cc dish, which is important for achieving your target compression ratio depending on your cylinder heads and block deck height.

This rotating assembly is a significant investment in the heart of your engine. It's important to note that this part is not CARB approved and cannot be shipped to California. Ensure you consult with your engine builder or refer to Manley's technical documentation for proper installation and balancing procedures to get the most out of this high-performance rotating assembly.