Rocker Arm Stud Girdles Aluminum For BB Ford 429-460 7/16 Stud Sold as Pairs ProformStud Girdles reduce flex and part breakage. Increased valvetrain rigidity helps minimize energy loss. Each set comes with aluminum stabilizers and poly locks. Two pieces per set. Sold as a kit Product Details: Engine Rocker Arm Stud Girdles PROFORM Race Series Clamp On Style Made From High Quality Aluminum Fits 429 460 Big Block Ford Engines Using 7 16 20 Stud Threads Works On Iron and Aluminum Cobra Jet Heads Poly Locks Included Purple Anodized