Part# ST2003 - Yella Terra Street Terra stud mount roller rocker set to suit Ford 429, 429-BOSS and 460 V8 engines commonly referred to as the 385 family of Ford big block engines or the Poly Angle big blocks. 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. Mounts on  7/16 screw in studs [not included], rocker arm ratio of 1.72 : 1

Your heads may require machining for screw in studs and guide plates. Screw in studs and guide plates sold separately; note hardened push rods have to be installed when using guide plates.

NOTE: Standard heads that require machining for screw in studs ~ remove .320” from Rocker pads, drill and tap 7/16” UNC, then fit studs and guide plates, sold separately