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All Pro Series head bolts have a reduced wrenching hex or 12-point head and wide area flange to eliminate the need for valve train removal for cylinder head retorquing and permits the use of larger diameter valve springs
and the powerful mid-range provides a rich
Top Outside Diameter: 5
3/16 Allen Finish: Black oxide
ARP 203-4702 Head Stud Kit for TOYOTA Supra 2JZA80 undercut ymm_82 All Pro Series head boltsIt 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
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