Part #: 260-4704. If you're aiming to reach 500 - 675 whp, these ARP head studs are your perfect choice! ARP uses top - notch 8740 chrome moly, much better than 'aircraft' quality. Each stud is vertically placed in special racks and precisely heat - treated to 270,000 psi. They come with 12 - point style nuts 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, allowing gaskets and cylinder heads to fit perfectly and align easily. After heat - treat, they are thread rolled, giving them ten times better fatigue strength than pre - heat - treat threaded studs. Each kit also includes premium parallel ground washers. These ARP head studs are essential for high - performance engines with increased boost and are the best in the market for your WRX or STI.
Using these ARP head studs is a straightforward process. First, use the 4mm Allen in the stud head to thread the studs into the block. Then, attach the 12 - point style nuts. Make sure gaskets and cylinder heads are properly placed as the studs are designed to let them glide into position and align perfectly. When it comes to maintenance, keep the studs clean and dry to prevent rust. If you notice any signs of wear or damage, it's best to replace them. Also, ensure that the engine is turned off and cooled down before working on the studs. Remember, these studs are made for engines aiming for 500 - 675 whp, so make sure your engine setup is appropriate for them.
