SBC Ultra Pro Magnum XD R/A - 1.5 7/16

The SBC Ultra Pro Magnum XD R/A - 1.5 7/16 rocker arm from COMP CAMS is engineered for serious small block Chevy and GM V6 builders seeking maximum valvetrain reliability and performance. This full-roller rocker arm is designed to reduce friction across the entire lift curve, enabling higher RPM capability and improved fuel efficiency compared to conventional stamped steel designs. Whether you're building a street engine, weekend warrior, or high-revving performance application, this ultra-duty component delivers the durability and precision required for modern engine demands.

Constructed from chromoly steel, the SBC Ultra Pro Magnum XD features full roller technology that minimizes deflection and wear on the pushrod and valve stem. The 1.5:1 mechanical advantage ratio provides optimal valve lift multiplication across the camshaft profile, while the 7/16-inch stud mount ensures secure, repeatable installation on your cylinder head. The Magnum XD series combines COMP CAMS' decades of valvetrain engineering with modern metallurgy, delivering consistent performance across extended duty cycles and high-load scenarios where standard rocker arms would falter.

This rocker arm is ideal for enthusiasts upgrading factory valvetrain geometry or installing performance camshafts that demand superior load handling. Installation requires compatible cylinder head studs and proper torque specifications; verify stud diameter and thread pitch before ordering. The compact dimensions (2.85 × 2.1 × 4.05 inches) ensure easy handling and hood clearance, while the 0.65-pound weight minimizes rotating mass without sacrificing strength—critical for engines exceeding 6,500 RPM.