ARP Head Stud Kits 8740 Series Undercut Studs Porsche 911 All 1976-1997

It 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, there's 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 penetration and the results are far superior to those lesser quality studs from other manufacturers who just dump pieces in a basket and hope for the best.

Following heat-treat, each stud is centerless ground to make it as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. It's important to note that lesser quality studs are not even centerless ground the material is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine). Because ARP studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned something that won't happen with inferior quality head studs

Vehicle Fitments:

Year	Make	Model	Submodel
1967 - 1987	Porsche	911	Base
1974 - 1998	Porsche	911	Carrera
1990 - 1996	Porsche	911	Carrera 2
1989 - 1998	Porsche	911	Carrera 4
1996 - 1998	Porsche	911	Carrera 4S
1998	Porsche	911	Carrera S
1973	Porsche	911	E, T
1992 - 1994	Porsche	911	RS America
1967 - 1977	Porsche	911	S
1978 - 1983	Porsche	911	SC
1989 - 1994	Porsche	911	Speedster
1994 - 1998	Porsche	911	Targa
1991 - 1998	Porsche	911	Turbo
1993 - 1994	Porsche	911	Turbo 3.6
1976 - 1989	Porsche	911	Turbo Carrera
1978 - 1979	Porsche	930	Turbo