ARP Head Stud Kit for Subaru EJ SOHC, N/A engines. Search no longer for the best Head Stud Kit you can wish for in your Subaru EJ engine. We've sold over a 500 sets of these, being used in all levels of motorsports! If you're not sure whether you need 260-4702 or 260-4701, contact us!
These are the 11mm head studs and are a must have for anyone rebuilding their EJ engine. These are made from 8740 Chrome Moly alloy and better than any aircraft quality material. These have 1000% better fatigue resistance than your standard Subaru head studs. Allowing much higher performance compared to stock products.
Modification to the block or cylinder head is not required, these will bolt straight into your engine.
8740 Chrome Moly: Until the development of today’s modern alloys, chrome moly was popularly considered a high strength material. Now viewed as only moderate strength, 8740 chrome moly is seen as a good tough steel, with adequate fatigue properties for most racing applications, but only if the threads are rolled after heat-treatment, as is the standard ARP production practice. Typically, chrome moly is classified as a quench and temper steel, that can be heat-treated to deliver tensile strengths between 180,000 and 210,000 psi.
ARP® - Automotive Racing Products are a manufacturer of fasteners/bolts found in engines and drivelines, ranging from OEM replacement parts to specialty hardware for racing applications. ARP is the world leader in fastener technology. These range from quality high performance OEM replacement parts to exotic specialty hardware for Formula 1, IndyCar, NASCAR and NHRA drag racing and marine applications.
In order to ensure optimum quality control, ARP has grown to be exceptionally self-reliant and now controls all aspects of the manufacturing process.
All operations are performed in-house and closely monitored. This is how ARP has been able to establish a reputation for “zero defects” quality throughout the industry.
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