ARP Head Stud Kit - GM 2.2L ECOTEC - 231-4701 Nissan 240Z The metal pin must be

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ARP Head Stud Kit - GM 2.2L ECOTEC - 231-4701 Nissan 240Z The metal pin must beIt 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 only uses premium grade 8740 alloy and a proprietary ARP2000 alloy that are rated far superior to aircraft quality alloy steels. Secondly, each stud is placed vertically into special racks and precisely heat treated