Ultra Pro Magnum Roller Rocker Arms 3/8" Stud Dia, 1.7 Ratio CO1629-16

Suit BB Chev 348-409 "W-Head"

CO1629-16

1629-16

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. Chevy V8 348-409 cid - 3/8" Stud - 1.7 Ratio Investment cast 8650 chromemoly body and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia. Unique black oxide exterior finish helps prevent corrosion and increases durability. Optimized retainer and valve spring clearances allow for 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. For use with up to 850 lbs of open spring pressure.