COMP Cams Rocker CB 1.8 7/16in Ultra Pro

If you're rebuilding the top end of your Chevrolet Big Block engine, especially for endurance, drag, or circle track racing, you need rocker arms that can handle the stress. The COMP Cams Ultra Pro Magnum XD Rocker Arms are built from tough 8650 steel, a material known for its strength and longevity, outperforming many import options. These are designed to work with a 7/16 inch stud and feature a 1.8 ratio, which can help improve valve lift and duration for better engine breathing.

What really sets these apart is the attention to detail in their construction. They incorporate a unique machined billet pushrod seat insert, adding exceptional durability right where it counts. Inside, you'll find precision-sorted needle bearings and hardened roller tips. These components work together to distribute loads more effectively and reduce wear, meaning a longer service life for your engine. They're also designed to be fully rebuildable, so you can maintain them over time. Plus, they're engineered to work with most common spring and retainer diameters, making installation smoother.

The XD design itself benefits from advanced FEA and CAD analysis, optimizing strength, stiffness, and moment of inertia. This means they're not just strong, but intelligently designed for high-performance applications. These rocker arms fit a range of Chevrolet vehicles, including popular models like the Chevelle, Camaro, and Corvette, from the mid-60s through the mid-70s. They can handle up to 1,000 lbs of spring pressure, making them a solid choice for serious engine builds.