COMP Cams Rockers CS 1.55 7/16in Ultra Pro

Built to outlast and outperform in accuracy and strength, Ultra Pro Magnum XD roller rocker arms are engineered from durable 8650 steel and include a machined billet pushrod seat insert for a wide range of super accurate ratios. These rocker arms are fully rebuildable and boast precision-sorted needle bearings and hardened roller tips. They work with most diameter springs and retainers. The XD design utilizes advanced FEA and CAD design and development to improve strength, stiffness and MOI (moment of inertia) optimization for drag and circle track applications. Designed for GM V6, 3.3/3.8/4.3L engines, with 7/16 inch stud and 1.55 ratio.