ARP Head Studs 11mm WRX 2002-2014 / STI 2004-2021 Subaru Turbo Models | 260-4701

260 - 4701 is a vital part for your upcoming build. It's an authentic ARP product, so watch out for fakes! These head studs fit Subaru WRX from 2002 to 2014 and Subaru STi from 2004 to 2021. If you're aiming for 500whp or less, these are perfect for you. ARP uses a top - grade 8740 alloy, much better than 'aircraft' quality. Each stud is vertically placed in special racks and precisely heat - treated to 200,000 psi. They come with a 12 - point style nut and are OE - 11mm sized. The stud head has a 4mm Allen for threading into the block. ARP head studs are made with extremely tight tolerances. Gaskets and cylinder heads fit smoothly and align perfectly. Thread - rolled after heat - treat, they have ten times better fatigue strength than pre - heat - treat threaded studs. Each kit includes premium parallel ground washers. They're a must for high - performance engines with increased boost and are the best on the market for your WRX or STI.

Using these ARP head studs is straightforward. First, make sure your engine is clean and ready for installation. Use the 4mm Allen in the stud head to thread the studs into the block properly. Then, attach the 12 - point style nut. When you put on the gaskets and cylinder heads, they should easily slide into place. Remember, these are authentic ARP products, so beware of fakes. If you're making 500whp or less, these studs are ideal. For maintenance, check the studs regularly for any signs of wear or damage. If you notice anything wrong, it's best to replace them. And since they're made with high - quality materials, they should last a long time with proper care.