3/8-16 X 1.250 hex black oxide bolts.
ARP Header Bolts 100-1111 3/8 SB CHEVY HEX HEAD BLACK OXIDE 3/8 WRENCH
ARP Header Bolts 100-1107 3/8 Universal Bolt kit 5/16 HEX HEAD BLACK OXIDE
ARP 134-5002 SBC High Performance 2-Bolt Main Bolts, Hex Head, Chromoly, Kit
ARP 140-5003 Mopar B/RB Pro 2-Bolt Main Bolts, Hex Head, Chromoly, Black, Kit
ARP 400-1502 Big Block Chevy, Timing Cover Bolts, Hex Head, Stainless Steel, Kit
ARP 134-5202 SBC High Performance 4-Bolt Main Bolts, Hex Head, Chromoly, Kit
