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The COMP Cams Ultra Pro Magnum roller rocker for LS cathedral-port heads is an 8650 chromemoly stud-mount arm with a black oxide finish and a 1.8:1 ratio for LS1/LS2/LS6, 4.8L, 5.3L and pre-'07 6.0L truck engines. It requires 3/8" studs and includes a poly lock on single stud-mount designs. Hardened roller tips, needle bearings and a robust chromemoly body increase stiffness and reliability under high spring loads.
COMP Cams Rocker Arm GM LS1 1.8 3/8 Ultra
