What is the ratio of this rocker arm?

This is a 1.8 ratio rocker arm. This means that for every amount of lift the camshaft lobe provides, the valve will open 1.8 times that amount.

What material is this rocker arm made from?

The rocker arm is made from 8650 chromemoly steel and features a black oxide coating. This construction is designed to be strong and resist corrosion.

What kind of spring pressure can this rocker arm handle?

This Ultra Pro Magnum rocker arm is rated to withstand up to 850 lbs of spring pressure, making it suitable for many performance applications.

COMP Cams Ultra Pro Magnum Rocker Arm 1.8 Ratio 1676-1

Name: COMP Cams Rocker Arm GM LS3 1.8 3/8 Ultra
Brand: COMP Cams
Price: 59.15 USD
Availability: InStock

COMP Cams Rocker Arm GM LS3 1.8 3/8 Ultra

$59.15

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COMP Cams Ultra Pro Magnum rocker arm for GM LS3 engines. Features a 1.8 ratio and 3/8" stud mount for improved valve lift.

Key Features

Fits 2007-2016 Cadillac, Chevrolet, GMC, Hummer, and Pontiac vehicles with GM LS3 engines.
Features a 1.8 ratio for increased valve lift.
Constructed from 8650 chromemoly steel for strength.
Black oxide coating resists corrosion.
Rated to withstand up to 850 lbs of spring pressure.
Single stud mount design.

⚠️ 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

This is the COMP Cams Ultra Pro Magnum rocker arm, designed for GM LS3, L99, and L76 engines with rectangle port heads. It features a 1.8 ratio, meaning it multiplies the camshaft's lift by 1.8 at the valve, which can help achieve more valve lift and duration for improved engine performance. This rocker arm is built from 8650 chromemoly steel and has a black oxide coating, making it strong enough to handle up to 850 lbs of spring pressure. It uses a single stud mount and requires 3/8" studs.

The Ultra Pro Magnum rocker arm is a well-built component for those looking to enhance their LS engine's valvetrain. Its robust construction from 8650 chromemoly steel ensures durability under demanding conditions, while the black oxide finish helps resist corrosion. The 1.8 ratio is a popular choice for LS applications seeking a noticeable increase in valve lift without requiring extensive modifications. This part fits a wide range of GM vehicles, including models like the Chevrolet Camaro, Cadillac CTS, and GMC Sierra 1500.