COMP Cams 1231-1 High Energy Steel Rocker Arm with 1.6 Ratio and 3/8" Stud Diameter for Ford 289-302 and 351 Windsor Engine Excellent replacement rocker arms for engine rebuilds with a stock or high energy camshaft Solid bar, one-piece design ties studs together and properly locates them Feature a long slot for higher than stock lift camshafts For Small Block ford 289-302 and 351 Windsor