V8 Valve Cover Stud Kit Bolts Stainless Steel 326 350 389 400 421 428 455 GTO - Bolt Kit for Installing the Valve Covers to Cylinder Heads - Fitment: Fits 326, 350, 389, 400, 421, 428, 455 PONTIAC V8 Engines; Fits Most OEM & Aftermarket Stamped Steel & Aluminum Valve Covers; Will Not Fit: Late Model Pontiac GTO w/ LS Engine. - Specifications: Hardened 304 Stainless Steel; (8) 5/16" x 1 1/2" Studs (polished); (8) 5/16" Hex Locking Flange Nuts (polished).