Product Description Specifications With a needle bearing fulcrum and a roller tip, our die cast aluminum rockers decrease friction and improve horsepower. Featuring a 1.73 ratio, this rocker fits Ford 351C and 429-460 w/ a 7/16" stud. Category: Engine Components>Rocker Arms Core: N LTL: N MPN: 17045-1 Proposition 65: Y Special Order: Y