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 complete with hardened parallel-ground washers. Product Features:1/2 12-Point Socket Size(s)8740 ChromolyBlack OxideBig Block Chevy Late Bowtie Aluminum, World Prod. Merlin, Iron Dart, Pro-1 and Pro Top Line HeadsSold As A Kit
