ARP 135-4207 – Cylinder Head 12pt Stud Kit, Professional Series, BBC Heads w/ BMP, World Aluminum Blocks (4 long exhaust Studs per head)
Big Block Chevy, World Merlin early aluminum heads w/ 4 long 2 short exhaust studs per head, (All Black Oxide) 4 long exhaust bolts per head. Use on Mark IV blocks