What is the primary benefit of a 1.7 rocker arm ratio?

A 1.7 rocker arm ratio means that for every amount the camshaft lobe lifts, the valve will open 1.7 times that amount. This generally leads to increased valve lift, which can improve airflow into and out of the cylinder, potentially boosting engine performance.

What is the advantage of the billet pushrod seat insert?

The machined billet pushrod seat insert is a unique feature that adds exceptional durability to the rocker arm. It provides a strong, stable seat for the pushrod, helping to prevent wear and deformation under high stress and load conditions.

Are these rocker arms compatible with all valve springs and retainers?

These Ultra Pro Magnum XD rocker arms are designed to work with most common diameter valve springs and retainers. However, it's always a good idea to confirm compatibility with your specific spring and retainer setup to ensure proper fitment and function.

COMP Cams Rocker Arms 1.7 Ratio 7/16in Stud 1817-16

Name: COMP Cams Rockers CS 1.7 7/16in Ultra Pro
Brand: COMP Cams
Price: 665.60 USD
Availability: InStock

COMP Cams Rockers CS 1.7 7/16in Ultra Pro

$665.60

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. 1.7 ratio, 7/16" stud, 8650 steel. Fits many Chevy V8s.

Key Features

Fits a wide range of Chevrolet and Buick vehicles from 1955-1996.
Features a 1.7 rocker arm ratio for improved valve lift.
Constructed from durable 8650 steel for long service life.
Includes a unique machined billet pushrod seat insert for exceptional durability.
Designed to 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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Will this fit your vehicle?

Product Details

If you're working on a Chevrolet Small Block engine, especially one from the 1950s through the 1990s, these COMP Cams Ultra Pro Magnum XD rocker arms are a solid choice for rebuilding or upgrading your valvetrain. They feature a 1.7 ratio, which means for every amount the camshaft lobe lifts, the valve will open 1.7 times that amount. This can help improve airflow and performance. They are designed to work with 7/16 inch rocker studs, common on many Chevrolet 265 to 400 cubic inch Small Block V8s, including popular applications like the Camaro, Corvette, and Chevelle.

What sets these rockers apart is their robust construction. They're machined from durable 8650 steel, a material known for its strength and longevity, and they include a unique machined billet pushrod seat insert for added durability where it counts. COMP Cams designed these rockers to handle significant spring pressure, up to 1,000 lbs, making them suitable for engines with aggressive camshafts and stiffer valve springs. The use of precision-sorted needle bearings and hardened roller tips helps to distribute loads evenly and reduce wear, contributing to a longer service life for your engine's valvetrain. These are also fully rebuildable, meaning you can service them if needed down the road.

When installing these, remember they are stud-mount rockers, so ensure your cylinder heads are drilled and tapped for 7/16 inch studs. They are designed to work with most common spring and retainer diameters, simplifying installation into many existing setups. If you're looking for a well-built, long-lasting rocker arm set for your Small Block Chevy build, these Ultra Pro Magnum XDs offer a lot of value and performance.