Ultra-Pro Magnum Roller Rocker Arms - Small Block Chevy 3/8" 1.6 Ratio (A) THE STRENGTH OF STEEL LIFETIME
GUARANTEE!
Pro Magnum Rocker Arms are so strong that we guarantee the rocker bodies for
life against breakage Made from high strength 8650 chrome moly steel and
designed by the latest computer technology to reduce mass at non-critical areas
The strength of steel yet lighter than aluminum This results in 5% less weight
at the valve than aluminum rockers This means more RPM and valve train
reliability.