Part# ST2035 - Yella Terra Street Terra pedestal mount roller rocker set to suit Ford 302, 351 Cleveland V8 engines. Direct bolts on with no machining required. Economically priced, entry level rollers that have a strong vacuum die formed light weight arm designed for high performance street and budget race applications that do not have excessively high valve spring pressures. For use with hydraulic camshafts. Includes pedestal mounts 5/16 UNC, rocker arm ratio of 1.72 : 1