What is the ratio of this rocker arm and what does it do?

This rocker arm has a 1.8 ratio. This means it multiplies the lift from your camshaft lobe by 1.8, resulting in greater valve lift. This can help improve airflow into and out of the engine's cylinders.

What material is this rocker arm made from and how much spring pressure can it handle?

The rocker arm is made from 8650 chromemoly steel, which is known for its strength and durability. It is designed to withstand spring pressures of up to 850 lbs.

What size stud does this rocker arm require?

This Ultra Pro Magnum rocker arm requires a 3/8" diameter stud. Ensure your cylinder heads are compatible with this stud size before installation.

COMP Cams Ultra Pro Magnum Rocker Arm 1.8 Ratio 1675-1

Name: COMP Cams Rocker Arm GM LS1 1.8 3/8 Ultra
Brand: COMP Cams
Price: 56.95 USD
Availability: InStock

COMP Cams Rocker Arm GM LS1 1.8 3/8 Ultra

$56.95

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 is known for performance valvetrain components. This Ultra Pro Magnum rocker arm features a 1.8 ratio for GM LS engines.

Key Features

Fits a wide range of GM LS engines, including Chevrolet Corvette, Camaro, and Silverado models.
Features a 1.8 ratio to increase valve lift.
Constructed from durable 8650 chromemoly steel.
Can withstand up to 850 lbs of spring pressure.
Includes a poly lock for secure adjustment.
Requires a 3/8" diameter stud for installation.

⚠️ 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

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

COMP Cams is a well-known name when it comes to performance valvetrain parts, and their Ultra Pro Magnum rocker arms are a popular choice for GM LS engine builds. This particular rocker arm is designed with a 1.8 ratio, meaning it multiplies the camshaft lobe lift by 1.8 to open the valve further, which can help improve airflow and performance. It's built from tough 8650 chromemoly steel, a material that can handle significant spring pressure, up to 850 lbs, making it suitable for many performance applications. This rocker arm fits a wide range of GM LS engines, including those found in vehicles like the Chevrolet Corvette, Camaro, and Silverado trucks, specifically for cathedral port head LS applications that use a 3/8" diameter stud.

The black oxide coating on this rocker arm isn't just for looks; it helps with durability and wear resistance. It includes a poly lock nut, which is a common feature on performance rockers that helps keep the adjustment secure. When installing, remember it requires a 3/8" stud, so make sure your cylinder heads are set up for that size. This is a solid option if you're looking to get a bit more out of your LS engine's valvetrain.