COMP Cams Ultra Pro Magnum Chromoly Roller Rocker Arm - 7/16 in Stud Mount - 1.52 Ratio - Small Block Chevy / GM V6 UNI-MAG 000 PSI tensile cast iron

000 PSI tensile cast iron or SAE D7003 ductile iron

It has none of the disadvantages of the crown type kits by being one unit

F-250 1959-1957

1958-1963 Alvis TD21

Clevite 77 manufactures a full line of exclusive TriMetal

COMP Cams Ultra Pro Magnum Chromoly Roller Rocker Arm - 7/16 in Stud Mount - 1.52 Ratio - Small Block Chevy / GM V6 UNI-MAG 000 PSI tensile cast ironThe Ultra Pro Magnum Roller Rocker Arms for Chevy V8 265 400 applications take stud mount rocker performance, stability and value to a whole new level. These rocker arms feature a 7 16" stud diameter and 1. 52 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