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

The 1.55 ratio changes the leverage applied to the valve. This generally results in more valve lift for a given camshaft lobe, which can improve airflow and engine performance.

Are these rocker arms compatible with all valve springs?

These rocker arms are designed to work with most common diameter springs and retainers. They are also rated to handle up to 1,000 lbs of spring pressure, indicating they are built for high-performance applications.

What does it mean that these rockers are 'fully rebuildable'?

Being fully rebuildable means that key components like the needle bearings can be replaced. This allows for maintenance and repair over time, extending the usable life of the rocker arms.

COMP Cams Ultra Pro Magnum XD Rocker Arms 1.55 Ratio 1808-16

Name: COMP Cams Rockers CS 1.55 7/16in Ultra Pro
Brand: COMP Cams
Price: 677.76 USD
Availability: InStock

COMP Cams Rockers CS 1.55 7/16in Ultra Pro

$677.76

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, 7/16" stud. Built from 8650 steel for durability.

Key Features

Fits a wide range of Chevrolet V8 engines with 7/16" studs, including many Buick and Cadillac models.
Machined from durable 8650 steel for long service life.
Features a unique machined billet pushrod seat insert for exceptional durability.
Utilizes precision-sorted needle bearings and hardened roller tips to reduce wear.
Designed to handle up to 1,000 lbs of spring pressure.
Fully rebuildable design for extended serviceability.

⚠️ 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

COMP Cams is well-known for making performance engine parts that help racers and enthusiasts get the most out of their vehicles. These Ultra Pro Magnum XD rocker arms are a prime example of their commitment to durability and performance. They are designed to handle the demands of high-performance engines, whether you're building for endurance, drag racing, or circle track. These rockers are a solid choice for anyone looking to improve their engine's valvetrain reliability.

These rocker arms are machined from strong 8650 steel, a material chosen for its ability to withstand significant stress. They also feature a unique machined billet pushrod seat insert, which adds another layer of durability where it counts. The XD design itself has been developed using advanced computer modeling (FEA and CAD) to optimize strength and stiffness, ensuring they can handle up to 1,000 lbs of spring pressure. Precision-sorted needle bearings and hardened roller tips are used to help distribute the load evenly and reduce wear, contributing to a longer service life for your engine. Plus, they are designed to be fully rebuildable, meaning you can service them down the line if needed. They also work with most common spring and retainer diameters.

This set is designed for Chevrolet Small Block engines with a 7/16-inch stud size, fitting a wide range of vehicles including popular models like the Chevrolet Camaro, Corvette, and Chevelle, as well as many Buick and Cadillac applications from the 1970s through the 1990s. They feature a 1.55 ratio, which is a common choice for improving valvetrain geometry and performance.