[Big Block 1.5 Ratio]

[Small Block 1.5 Ratio]

The shaft mount Ultra Pro Magnum roller rocker arms for Chrysler V8 273-360 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 shaft mount rocker arms feature a 1.5 ratio. The 8650 chrome moly 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 value spring clearances allow for use of most diameter springs, retainers and +.050 inches locks without clearance or fitment issues.