Head Stud Kit1955-2000 Chevy Small Block 262-400 ci V8Undercut Studs8740 Chromoly SteelBlack Oxide Finish12-Point Nuts & WashersSold as a Kit Speedmaster 746-PCE279.1001 Features:Each stud is machined & cold-forged from aircraft quality 8740 high tensile strength Chromoly, allowing a rating of up to 190,000 psiEvery kit comes complete with 12-point nuts and hardened parallel washers, producing a higher clamping force and a more accurate torque readingUndercut studs mean a significantly reduced chance of the studs pulling out of the block under high performance, high rpm situationsNote: This kit is designed to fit stock Pre-1987 Gen I small block chevy cylinder heads or Pro Comp equivalent.