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ARP Head Studs for the K Series motor are constructed of a premium grade 8740 alloy that is rated far superior to aircraft quality. This alloy is heat-treated to 190,000 psi for complete heat penetration. 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. 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 will not happen with inferior quality head studs. ARP studs are thread rolled after heat-treat, which gives them about 1000% (that is ten times) better fatigue strength than those studs that are threaded prior to heat-treatment.
ARP Head Studs 11mm WRX 2002-2014 / STI 2004-2019 Subaru Turbo Models (260-4701)
ARP Ultra Torque Assembly Lube 10oz - Universal (100-9910)
ARP Wheel Stud Kit 1.75in WRX/STI 02-14 / BRZ / FR-S 13-17 (100-7727)
ARP Custom Age Head Stud Kit Subaru WRX 2002-2014 / STI 2004-2019 DOHC (260-4704)
ARP Head Stud Kit Washer Ford/Subaru (APW995N)
ARP 12 Point Head Stud Kit Mitsubishi EVO 8 / EVO 9 2003-2006 (207-4203)
ARP Turbo Head Stud Kit Hyundai Genesis 2.0T 2010-2013 (228-4301)
ARP Connecting Rod Bolts Toyota Supra Turbo 1987-1992 (203-6004)
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