These Ultra Pro Magnum rockers are made of black oxide coated 8650 chromemoly steel that can withstand up to 850 lbs of spring pressure. Featuring a 1.52 ratio, these rockers fit Chevrolet Small Blocks with a 3/8" diameter stud.
ULTRA Pro Magnumâ„¢ Roller Rocker Arms. The Ultra Pro Magnumâ„¢ Roller Rocker Arms not only live up to the lofty standards of the original Pro Magnumâ„¢ Rockers, but they also take Stud mount Rocker performance, stability and value to a whole new level. The modern arched, web-like design delivers increased strength and rigidity while still reducing the moment of inertia and optimizing the dynamic balance. Applications: Chevrolet Small Block 265-400 c.i.d. V8 3/8" Studs / 1.52:1 Ratio. Investment cast 8650 chromemoly body and arched, weblike design deliver increased strength and rigidity while reducing M.O.I. Unique black oxide exterior finish helps prevent corrosion, thus increasing durability Increased retainer and valve spring clearances allow use of large diameter springs, retainers and +.050" locks with o clearance or fitment issues Feature Oversized trunnions, precision-sorted needle bearings and hardened Roller tips withstand valve spring pressures up to 850 lbs. Also Available in A Rocker/Pushrod Kit
