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ARP Big Block Chevy 409 Hex Head Stud Kit - arp135-4002 import_2022_03_21_012537 -cc Suspension::Air Compressor Systems 1980It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all out competition powerplants. Simply stated, theres not a better stud setup on the market today. For openers, ARP uses a premium grade 8740 alloy that is rated far superior to aircraft quality. Each stud is placed vertically in special racks and precisely heat treated to 200,000 psi. This procedure ensures complete heat