Big Block Chevy With MERLIN Cylinder Heads Head Stud Kit GENUINE ARP Part Number 235-4316 12 Point Nuts Fits : Big Block Chevy With MERLIN Cylinder Heads (8 long exhaust studs) Made From 8740 Chrome Moly Steel And Heat Treated To 190,000 PSI Strength Threads Are Rolled After Heat Treat For Strength And Better Torquing Kit Includes 12 Point Nuts, Washers, Studs And ARP Ultra Torque Fastener Lube For Both Heads ALL ARP Products Are Made in The USA !!! Message Us With Any Questions See Our EBAY STORE For Your ENGINE And PERFORMANCE Needs