What is the benefit of the 1.73 ratio?

The 1.73 ratio means that for every 1 inch of pushrod movement, the valve will open 1.73 inches. This results in increased valve lift compared to a stock or lower ratio rocker arm, which can help improve engine performance.

Are these rocker arms sold individually or as a set?

These Ultra Pro Magnum XD rocker arms are sold as a set, typically for a complete engine build. Please check the product details to confirm the exact quantity included in the package.

What is the advantage of the billet pushrod seat insert?

The billet pushrod seat insert is a unique feature that adds exceptional durability to the rocker arm. It reinforces the area where the pushrod contacts the rocker arm, helping to prevent wear and deformation under high stress.

COMP Cams Ultra Pro Magnum XD Rocker Arms 1823-1

Name: COMP Cams Rocker CB 1.73 7/16in Ultra Pro
Brand: COMP Cams
SKU: comp-cams-comp-cams-rocker-cb-1-73-7-16in-ultra-pro-t14-4390860
Price: 63.41 USD
Availability: BackOrder

COMP Cams Rocker CB 1.73 7/16in Ultra Pro

$63.41

On Backorder

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

COMP Cams Ultra Pro Magnum XD rocker arms with a 1.73 ratio and 7/16" stud. Built from durable 8650 steel for improved strength.

Key Features

Fits a wide range of Chevrolet Big Block engines including 396, 427, and 454 cubic inch displacements.
Features a 1.73 rocker arm ratio for improved valve lift.
Designed for use with 7/16 inch rocker arm studs.
Constructed from durable 8650 steel for long service life.
Includes a unique machined billet pushrod seat insert for added strength.
Utilizes precision-sorted needle bearings and hardened roller tips to reduce wear.

⚠️ 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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Will this fit your vehicle?

Product Details

If you're rebuilding the top end of your Chevrolet Big Block engine, especially for endurance, drag, or circle track racing, a strong set of rocker arms is crucial. These Ultra Pro Magnum XD rocker arms from COMP Cams are built to handle the demands of high-performance applications. They feature a 1.73 ratio and are designed for engines using a 7/16 inch stud, like the popular Chevrolet 396, 427, and 454 cubic inch big blocks.

What sets these apart is their construction. They're machined from durable 8650 steel, which is known for its strength and longevity, outperforming many import options. You'll also find a unique machined billet pushrod seat insert that adds exceptional durability right where it counts. COMP Cams also incorporated precision-sorted needle bearings and hardened roller tips. This design helps distribute the load more effectively, reducing wear and extending the service life of the rocker arms, even under heavy spring pressures up to 1,000 lbs.

These rocker arms are also fully rebuildable, meaning you can service them down the road if needed. They're designed to work with most common spring and retainer diameters, making them a versatile choice for a wide range of Chevrolet Big Block builds. This set fits a variety of vehicles including the Chevrolet Chevelle, Camaro, Corvette, and Impala from the mid-60s to mid-70s.