Product Description Specifications Perfect for stock or High Energy camshaft equipped engines, our High Energy rockers eliminate slop and feature a long slot for higher lift cams. This 1266 rocker features a 1.6 ratio for 3/8" stud'67-'78 Ford 240-300. Category: Engine Components>Rocker Arms Core: N LTL: N MPN: 1266-1 Proposition 65: Y Special Order: Y