Part #: 260 - 4704. If you're aiming for 500 - 675whp in your Subaru WRX or STI, these ARP head studs are your ideal choice! ARP uses high - grade 8740 chrome moly, which is much better than 'aircraft' quality. Each stud is vertically placed in special racks and precisely heat - treated to 270,000 psi. They feature a 12 - point style nut and are OE - 11mm in size. The stud head has a 4mm Allen for threading into the block. ARP studs are made with extremely precise tolerances. Gaskets and cylinder heads can easily slide into place and align perfectly. These studs are thread - rolled after heat - treatment, offering about ten times better fatigue strength than those threaded before heat - treatment (a common industry practice). Although it's costly and tough on tooling, the results are really worth it. Each kit also includes premium parallel ground washers. ARP head studs are essential for performance engines with increased boost and are the best on the market for your WRX or STI.
Using these ARP head studs in your Subaru WRX or STI is easy. First, make sure your engine is clean and ready for installation. Use the 4mm Allen on the stud head to thread the studs into the block. Then, attach the 12 - point style nuts. You'll notice that the gaskets and cylinder heads will fit smoothly. When it comes to maintenance, keep the studs clean and check for any signs of wear or damage regularly. If you notice any issues, it's best to replace them right away. Remember, these studs are designed for engines aiming for 500 - 675whp, so don't use them for engines with significantly different power outputs. Also, make sure to use the included premium parallel ground washers for the best performance.
