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The COMP Cams Ultra Pro Magnum rocker for rectangle-port LS heads is an 8650 chromemoly stud-mount roller arm with a black oxide finish and a 1.8:1 ratio for LS3/L99/L76 applications. It requires 3/8" studs and uses a needle-bearing fulcrum and hardened roller tip to increase stiffness and lift without swapping cams. The robust chromemoly construction and optimized design improve valvetrain dynamics under higher spring pressures.
COMP Cams Rocker Arm GM LS3 1.8 3/8 Ultra
