Cylinder Head Stud Kit for Subaru EJ Series DOHC Custom Age 625+

Cylinder Head Stud Kit for Subaru EJ Series DOHC Custom Age 625+It is for good reason that virtually every top professional enginebuilder relies on ARP Pro Series head studs for their all out competitionpowerplants. Simply stated, theres not a better stud setupon the market today. For openers, ARP only uses premium grade 8740 alloy anda proprietary ARP2000 alloy that are rated far superior to aircraftquality alloy steels. Secondly, each stud is placed verticallyinto special racks and precisely heat treated to

The threads are rolled after heat-treating which gives them about 2000% better fatigue strength than most main bolts that are threaded prior to heat-treating

premiumgrade aerospace chrome moly steel

the harmonic damper absorbs incredible amounts of kinetic energy

limited rule ovaltrack competition and street use

and precision J-form threads rolled after heat-treat to create a fastener that has threads 2000% stronger than others

Specially drilled “NASCAR” models are available for those who wish to safety wire their header bolts to prevent loosening

The ARP Stainless material is not affected by corrosion or extreme heat

That’s why ARP developed the Wave-Loc design that features symmetrical waves and has an effective interference range of

Material: Stainless Steel

ARP’s Pro Series rocker arm studs are made of premium grade 8740 chrome moly steel and heat-treated to a tensile strength of 190

12-point designs

delivers a material with superior fatigue characteristics and typically tensile strength in the 260