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 designed for serious small-block Chevy engine builders and high-performance enthusiasts who demand maximum reliability and consistent valve actuation. These full-roller rocker arms are ideal for street engines, circle-track racing, and both naturally aspirated and forced-induction applications where durability and repeatability are essential.

Constructed from chromoly steel and finished to exacting tolerances, the Ultra Pro Magnum XD design features a full roller tip that tracks the cam lobe with minimal wear. This design helps to extend service life and maintain valve timing accuracy over thousands of heat cycles. Each arm in this complete set provides a 1.60:1 mechanical advantage ratio, delivering precise valve lift multiplication while reducing parasitic losses from arm flex and deflection.

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 a standard stud-mounted cylinder head configuration, and it is important to verify your existing stud size and head casting compatibility before ordering. This complete set includes 16 arms, ensuring comprehensive coverage for your small-block engine needs.