Big Block Chevy With DART BIG CHIEF Heads Head Stud Kit GENUINE ARP Part Number 235-4312 12 Point Nuts Fits : Big Block Chevy With DART BIG CHIEF Heads 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