What is the benefit of a 1.75 ratio rocker arm?

A higher ratio rocker arm, like the 1.75 in this set, multiplies the camshaft's lift. This means the valve opens further, allowing more air and fuel into the cylinder and more exhaust out, which can lead to increased horsepower and torque.

Are these rocker arms suitable for street use or only racing?

While engineered for drag and circle track racing, their durable construction and precision components also make them a strong option for high-performance street engines that see spirited driving. The roller tip and needle bearings help reduce wear.

What size stud do these rocker arms use?

This specific set, the COMP Cams Ultra Pro Magnum XD, uses a 7/16 inch stud size, which is a common size for many performance big-block Chevrolet engines.

COMP Cams Ultra Pro Magnum XD Rocker Arms 1827-16

Name: COMP Cams Rockers CB 1.75 7/16in Ultra Pro
Brand: COMP Cams
Price: 667.05 USD
Availability: InStock

COMP Cams Rockers CB 1.75 7/16in Ultra Pro

$667.05

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COMP Cams Ultra Pro Magnum XD Roller Rocker Set with 1.75 ratio for BBC. Built for accuracy and strength in demanding applications.

Key Features

Fits a wide range of Chevrolet and Ford applications, including popular models like the Chevrolet Chevelle, Camaro, and Impala.
Features a 1.75 ratio, commonly used to increase valve lift for improved engine performance.
Constructed from durable 8650 steel for enhanced accuracy and strength in high-stress environments.
Includes a machined billet pushrod seat insert for precise ratio control.
Equipped with precision-sorted needle bearings to effectively distribute load and reduce wear.
Hardened roller tips minimize friction and wear on valve stems.

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Will this fit your vehicle?

Product Details

If you're rebuilding the valvetrain on your high-performance Chevrolet or Ford engine, especially for drag or circle track racing, these COMP Cams Ultra Pro Magnum XD Roller Rocker Arms are a solid choice. They're designed to handle the increased stress and demand of performance builds, offering improved accuracy and strength over stock components. The 1.75 ratio is a popular upgrade for many big-block Chevy applications, helping to increase valve lift for better airflow and power.

These rockers are well-built from durable 8650 steel, which is known for its strength and longevity in demanding engine environments. A key feature is the machined billet pushrod seat insert, which ensures a wide range of accurate ratios are available and helps maintain consistent geometry. Inside, you'll find precision-sorted needle bearings that help distribute loads effectively, reducing wear and extending the life of the rocker arm. The hardened roller tips are also designed to minimize friction and wear on your valve stems.

COMP Cams engineered these XD rockers using advanced FEA and CAD analysis to optimize their strength, stiffness, and moment of inertia, making them suitable for endurance racing and intense competition. They are also designed to work with most common spring and retainer setups, simplifying installation. This set includes 16 rocker arms, enough for a V8 engine, and features a 7/16 inch stud size, common on many performance big-block Chevy engines.