Ultra-Pro Magnum Roller Rocker Arms - (SB Chevrolet 1.60:1)
The Ultra Pro Magnum roller rocker arms for small block Chevrolet V8 265-400 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. The 8650 chromemoly alloy 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 trunnions, 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. Verification is recommended.
INSTALLATION NOTES:
1) Due to the oversized roller trunnion diameter, longer rocker studs may be required for full thread engagement of the poly-locks. We recommend a minimum of 5/8" of thread engagement.
2) These rockers require push rod guide plates and hardened push rods. Cannot be used on rail style valvetrain.
DETAILS: 1.60:1 ratio and 7/16" rocker stud diameter
PART NUMBER: COMP-1605-16
