Competition Cams 1211-16 High Energy Steel 1.7 Ratio, 7/16" Stud Diameter Rocker Arm for Big Block Chevrolet Excellent replacement rocker arms for engine rebuilds with a stock or High Energy Camshaft Help to eliminate noise and slop associated with worn or high mileage stock rocker arms Include adjusting nuts and pivot balls where required Feature a long slot for higher than stock lift camshafts