COMP Cams Ultra Pro Magnum Roller Rocker Arm Set 8650 Chromemoly Oversized Tr...

COMP Cams Ultra Pro Magnum Roller Rocker Arm Set (8650 Chromemoly) — Shaft Mounted, 1.5 Ratio High-strength performance rocker arms engineered for Chrysler 383–440 big blocks. Investment-cast 8650 chromemoly construction and an arched, web-like design increase rigidity while reducing moment of inertia for faster valve action and improved dynamic balance. Material: 8650 chromemoly Finish: Black oxide for corrosion resistance and durability Design: Arched web-like body lowers weight, raises strength Ratio: 1.5 — shaft mounted for Chrysler 383–440 Bearings & tips: Oversized trunnions, precision-sorted needle bearings, hardened roller tips Spring compatibility: Optimized retainer and spring clearances accept most diameter springs, retainers and +.050" locks Pushrod requirement: Ball/ball style pushrods Spring capacity: Rated for use with up to 850 lbs open spring pressure Warranty: Lifetime warranty on rocker bodies against breakage Built for serious performance—and proven in the field—these Ultra Pro Magnum roller rockers deliver durability, precise valvetrain control and compatibility with high spring pressures for aggressive builds.