What is the ratio of these rocker arms?

These COMP Cams Ultra Pro Magnum XD rocker arms have a 1.65 ratio. This ratio affects how much the valve opens relative to the camshaft lobe lift.

What size stud do these rocker arms use?

This set of rocker arms is designed for engines that use 3/8-inch rocker arm studs.

Are these rocker arms rebuildable?

Yes, these Ultra Pro Magnum XD rocker arms are fully rebuildable. This allows for maintenance and replacement of wear components to extend their service life.

COMP Cams Rocker Arms 1.65 Ratio 3/8in Stud 1803-8

Name: COMP Cams Rockers CS 1.65 3/8in Ultra Pro
Brand: COMP Cams
Price: 353.63 USD
Availability: InStock

COMP Cams Rockers CS 1.65 3/8in Ultra Pro

$353.63

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 for Small Block Chevy engines. 1.65 ratio, 3/8in stud.

Key Features

Fits 62+ vehicle make/model combinations.
Constructed from durable 8650 steel for extended service life.
Features a unique machined billet pushrod seat insert for exceptional durability.
Includes precision-sorted needle bearings and hardened roller tips to distribute load and reduce wear.
Designed to work with most common spring and retainer diameters.
XD design optimized for strength and stiffness using advanced computer modeling.

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Will this fit your vehicle?

Product Details

If you're rebuilding the top end of your Small Block Chevy engine, paying attention to the rocker arms is key. These COMP Cams Ultra Pro Magnum XD rocker arms are built from tough 8650 steel, which is known to last longer than many other rocker arms out there. They feature a unique machined billet pushrod seat insert for added durability, making them a solid option for a variety of performance builds.

What sets these apart is the precision-sorted needle bearings and hardened roller tips. These components work together to help spread the load more evenly and reduce wear, ultimately giving you a longer service life from your valvetrain. They're also designed to work with most common spring and retainer diameters, and the XD design itself was developed using advanced computer modeling to optimize strength and stiffness for endurance and drag racing applications.

This set includes 8 rocker arms, designed for engines with 3/8-inch studs and a 1.65 ratio. They fit a wide range of Chevrolet, Buick, and Cadillac vehicles from the 1950s through the 1990s, so be sure to check the fitment details to confirm compatibility with your specific car.