S&S Cycle Roller Rocker Arms 90-4320 Forged from 4140 steel heat treated and shot peened for maximum strength Roller tip reduces side thrusting on valve stem in high lift applications .750 long bushings provide 50% more load bearing area than stock style rocker arms Can be oiled through pushrods when used with S&S Shovelhead style tappet guides and pushrods 1.5:1 rocker ratio Compatible with stock or S&S billet rocker boxes