Hex Head Bolt Kit by ARP®. Hex Head Finish: Black. Material: 8740 Chrome Moly. 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.
ARP Head Bolt Kit Chevrolet Small Block LS1 & LS6, 5.7L & 6.8L hex Kit #: 134-3609