Comp Cams 1632-16 Ultra Pro Magnum roller rocker arms. Fits Ford 289 302 and 351W engines. 1.6 ratio. Use with 7/16" studs. The Ultra Pro Magnum Roller Rocker Arms 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. 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" locks without clearance or fitment issues. Sold as a complete set of rockers with attaching nuts. Comp Cams 1632-16 Comp Cams Ultra Pro Magnum roller rocker arms Ford small block 1632-16 We welcome CANADIAN customers! For ordering information, click on "Orders To Canada" at the top left side of this page. PAYMENT METHODS: PayPal, Visa, Mastercard, Discover, American Express, money orders.