ARP Head Bolt Kit, 12-Point Head (AR134-3710)HEAD BOLTS, GM LS 12 POINT Suit Chev Gen III LS Series (2004 On) Bolts All Same Length (except LS9) Part Number: AR134 3710 High Performance Series High Performance Head Bolts Are Available With A Reduced Wrenching Hex Or 12 point And Wide Area Flanged Head That Eliminates The Need For Valve Train Removal To Facilitate Cylinder Head Retorquing. All High Performance Series Bolts Are 180,000 Psi (which Is 15% Stronger Than Grade 8) And Kits Come