Small Block Ford 3/8" 1.6 Ratio 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.