What is the main benefit of the 1.55 ratio on these rocker arms?

The 1.55 ratio means that for every amount the camshaft lobe lifts, the rocker arm will open the valve slightly more, increasing overall valve lift. This can contribute to improved engine performance.

Are these rocker arms compatible with aftermarket valve springs?

Yes, these Ultra Pro Magnum XD rocker arms are designed to work with most diameter springs and retainers. They are also rated to handle up to 1,000 lbs of spring pressure, making them suitable for many performance applications.

What makes the pushrod seat insert unique?

The unique machined billet pushrod seat insert is designed for exceptional durability. It helps to ensure a solid connection and reduce wear where the pushrod contacts the rocker arm.

COMP Cams Ultra Pro Magnum XD Rocker Arms 1807-1

Name: COMP Cams Rocker CS 1.55 3/8in Ultra Pro
Brand: COMP Cams
Price: 55.95 USD
Availability: InStock

COMP Cams Rocker CS 1.55 3/8in Ultra Pro

$55.95

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. 1.55 ratio, 3/8" stud, 8650 steel. Fits many V6 and Small Block Chevy engines.

Key Features

Fits a wide range of Chevrolet V6 and Small Block engines.
Features a 1.55 rocker arm ratio for increased valve lift.
Constructed from durable 8650 steel for extended service life.
Includes a unique machined billet pushrod seat insert for exceptional durability.
Can handle up to 1,000 lbs of spring pressure.
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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Product Details

If you're rebuilding the top end of your V6 or Small Block Chevrolet engine, paying attention to your rocker arms is key. These Ultra Pro Magnum XD rocker arms from COMP Cams are built from durable 8650 steel, which is known to last longer than many other rocker arm materials. They feature a unique machined billet pushrod seat insert for added durability, and they can handle spring pressures up to 1,000 lbs. This makes them a solid option for endurance, drag, or circle track applications where reliability is crucial.

The 1.55 ratio on these stud-mount rockers helps to increase valve lift, and they use precision-sorted needle bearings along with hardened roller tips. This design helps distribute load more effectively and reduces wear, contributing to a longer service life for your valvetrain. They are also designed to work with most common spring and retainer diameters, making installation more straightforward. These rockers fit a wide range of Chevrolet V6 and Small Block engines, including popular models like the Camaro, Corvette, and Chevelle.