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The COMP Cams Ultra Pro Magnum roller rocker arm is a stud-mount rocker with a 1.7 ratio and 3/8" stud for Chevrolet 348-409 ci V8 engines. Investment-cast 8650 chromemoly construction and a black oxide finish increase strength and resistance to corrosion. Oversized trunnions, precision-sorted needle bearings and hardened roller tips reduce inertia and support up to 850 lbs of spring pressure for reliable valve-train operation.
COMP Cams Rocker Arms348/409 Chevy 1.7
