What is the benefit of a 1.8 ratio rocker arm compared to stock?

A 1.8 ratio rocker arm means that for every movement of the camshaft lobe, the valve opens further than a stock ratio. This increased lift helps improve airflow into and out of the cylinder, potentially leading to better engine performance and power.

What specific engine configurations do these rocker arms fit?

These rocker arms are designed for GM LS engines with cathedral port heads, including LS1, LS2, LS6, and truck engines like the 4.8L, 5.3L, and pre-'07 6.0L. They require 3/8" studs and guide plates.

What is included in this set?

This is a full set of 16 Ultra Pro Magnum rocker arms, designed for a complete engine build. It also includes poly locks for secure adjustment and installation.

COMP Cams Rocker Arms 1.8 Ratio 3/8" Stud 1675-16

Name: COMP Cams Rocker Arms GM LS1 1.8 3/8 Ultra
Brand: COMP Cams
Price: 657.43 USD
Availability: InStock

COMP Cams Rocker Arms GM LS1 1.8 3/8 Ultra

$657.43

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Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

COMP Cams Rocker Arms GM LS1 1.8 3/8 Ultra. Boost lift and stiffness for your LS engine without changing cams.

Key Features

Fits a wide range of GM LS engines including LS1, LS2, LS6, and cathedral port head truck applications.
Features a 1.8:1 ratio to increase valve lift and stiffness over stock rockers.
Constructed from 8650 chromemoly steel for strength and durability.
Can withstand up to 850 lbs of spring pressure.
Includes a full set of 16 stud mount rockers and poly locks.
Requires 3/8" studs and guide plates 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

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Will this fit your vehicle?

Product Details

If you're looking to get more performance out of your GM LS engine, especially if you're working on a cathedral port head application, these Ultra Pro Magnum rocker arms from COMP Cams are a solid choice. They're designed to increase valve lift and stiffness over stock components, allowing you to achieve improved performance without needing to swap out your camshaft. This set is specifically built for popular LS engines like the LS1, LS2, and LS6, as well as many truck engines like the 5.3L and pre-'07 6.0L.

These rockers are constructed from 8650 chromemoly steel, which is known for its strength and durability, capable of handling up to 850 lbs of spring pressure. The 1.8 ratio means that for every movement of the camshaft, the valve opens further, contributing to better cylinder filling and more power. They feature a black oxide coating for added protection and are designed to work with 3/8" studs and guide plates, fitting GM LS flat tappet configurations. This full set includes 16 stud mount rockers and poly locks, ensuring you have what you need for a complete installation on your engine.

This set fits a wide range of GM vehicles, including popular models like the Chevrolet Silverado, Suburban, Tahoe, and GMC Sierra trucks, as well as Cadillac CTS and Chevrolet Impala. It's important to note that these require 3/8" studs and guide plates for installation. Always refer to the manufacturer's installation instructions for specific details and any additional hardware you might need.