COMP Cams 1631-8 - Rocker Arms, FS/FW 1.6 3/8 Ultra Pro Mag

COMP Cams Ultra Pro Magnum Roller Rocker Arms, 1.6 Ratio, 3/8" Stud Diameter, Small Block Ford 289-302 and 351 Windsor, Set of 8 The Ultra Pro Magnum Roller Rocker Arms for Small Block Ford 289-302 and 351 Windsor applications not only live up to the lofty standards of the original Pro Magnums, but they also take stud mount rocker performance, stability and value to a whole new level. These rocker arms feature a 3/8" stud diameter and 1.6 ratio. The 8650 chromemoly material and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia and optimizing the dynamic balance. A unique black oxide exterior finish helps prevent corrosion and increases durability. Featuring oversized trunnions, precision-sorted needle bearings and hardened roller tips for the ultimate in performance and dependability. Optimized retainer and valve spring clearances allow for use of most diameter springs, retainers and +.050" locks without clearance or fitment issues. For Small Block Ford 289-302 and 351 Windsor applications, 1.6 ratio, 3/8" studs; Investment cast 8650 chromemoly body and arched, web-like design deliver increased strength and rigidity while reducing moment of inertia; Unique black oxide exterior finish helps prevent corrosion, thus increasing durability; Optimized retainer and valve spring clearances allow use of most diameter springs, retainers and +.050" locks without clearance or fitment issues; Feature oversized trunnions, precision sorted needle bearings and hardened roller tips