ARP Head Studs Subaru EJ Series Phase 2 SOHC - Most Naturally Aspirated SOHC Subaru Models

Engineered with precision and durability in mind, these head studs are tailored for enthusiasts pushing their vehicles beyond factory specifications, particularly those seeking increased boost and power levels. The ARP Head Stud Kit provides the robustness needed to prevent head lifting, making it an essential choice for those building engines for racecars, rally cars, overlanders, or even daily drivers demanding enhanced performance.

ARP uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality. Then, each stud is placed vertically in special racks and precisely heat-treated to 200,000 psi.  ARP studs are thread rolled after heat-treat, which gives them about 1000% (ten times) better fatigue strength than those studs that are threaded prior to heat-treat. 

Socket Sizes:

• 9/16" 12 Point
• 4mm Allen

Installation Instructions