SBC Ultra Pro Magnum XD R/A's - 1.6 7/16

The COMP Cams SBC Ultra Pro Magnum XD R/A's rocker arm set is engineered for serious small-block Chevy engine builders and high-performance enthusiasts who demand maximum reliability and consistent valve actuation. These full-roller rocker arms eliminate the friction inherent in traditional stamped-steel designs, making them the preferred choice for street engines, circle-track racing, and naturally aspirated or forced-induction applications where repeatability and durability matter most.

Each arm in this 16-piece set features a 1.6:1 mechanical advantage ratio, delivering precise valve lift multiplication across your camshaft profile while reducing parasitic losses from arm flex and deflection. Constructed from chromoly steel and finished to exacting tolerances, the Ultra Pro Magnum XD design incorporates a full roller tip that tracks the cam lobe with minimal wear, extending service life and maintaining valve timing accuracy over thousands of heat cycles. The 7/16-inch stud mount interface ensures direct, rigid attachment to your cylinder heads without binding or lateral movement.

Small-block Chevy builds—whether 283, 327, 350, or 400 cubic inch variants—benefit from the predictable geometry and proven track record of COMP Cams rocker arms in competitive and street applications. Installation requires standard stud-mounted cylinder head configuration; verify your existing stud size and head casting compatibility before ordering. This complete 16-arm set covers a full small-block engine and arrives ready to install with OEM or aftermarket cam profiles.