COMP Cams Rocker Arms348/409 Chevy 1.7 1629-12

The Ultra Pro Magnum Roller Rocker Arms for Chevy V8 348-409 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 1.7 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" locks without clearance or fitment issues. COMP Cams Ultra Pro Magnum Roller Rocker Arms, 1.7 Ratio, 3/8" Stud Diameter for 348, 409 Chevrolet, Set of 12 For 348-409 Chevrolet V8 applications, 1.7 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 trunions, precision sorted needle bearings and hardened roller tips Fits, Fitments 1958 Chevrolet Del Ray Base 1959 Chevrolet Kingswood Base 1960 Chevrolet K10 Pickup Base 1960 Chevrolet Kingswood Base 1961 Chevrolet K10 Pickup Base 1961 Chevrolet Kingswood Base