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IMPORTANT NOTICE: Images are for representation purpose only. Actual product size and configuration available may differ from those shown. For specific size and model, please refer to the manufacturer website using MPN (manufacturer part number shown in description).-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 7/16 inch 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 trunions, 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 inch locks without clearance or fitment issues. - For Small Block ford 289-302 and 351 Windsor applications, 1.6 ratio, 7/16 inch 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 inch locks without clearance or fitment issues | Feature oversized trunions, precision sorted needle bearings and hardened roller tips - SBF Rocker Arm - 1.6 Ratio 7/16 Stud - 036584196143