This IAG / ARP 14mm Head Stud Set is a must - have for high - horsepower Subaru engines. It fits Subaru EJ25, FA20 DIT and 2.0L EJ20 engines. The compatible models include the 2002 - 2021 Subaru WRX, 2004 - 2021 Subaru STI, 2005 - 2009 Subaru Legacy GT, and 2004 - 2013 Subaru Forester XT. The larger 14mm studs increase load capacity, preventing cylinder head lift and head gasket failures. Installation requires drilling and tapping the engine case, splitting the locating dowels, and enlarging the head stud hole clearances in the cylinder head. The set comes with 12 ARP2000 14mm x 1.5mm Head Studs, 12 ARP Washers, 12 ARP Nuts, and 1 ARP Fastener Assembly Lube. For installation, use head gaskets with 14mm stud provisions or drill them to fit the larger studs.
How to use: First, make sure you have all the parts in the set - 12 head studs, 12 washers, 12 nuts, and 1 tube of fastener assembly lube. Before installing, use the lube on the studs as instructed. Fit the head gaskets properly, either using ones with 14mm stud provisions or drill them if needed. Then, split the OEM locating dowels, drill and tap the engine case, and drill out the cylinder head stud holes. Finally, install the head studs, washers, and nuts. Notes: This is a high - performance part, so installation should be done carefully. It's best to have some mechanical knowledge or get help from a professional. Maintenance: Check the studs regularly for tightness. If you notice any signs of wear or loosening, it's time to replace the parts.
