ARP Main and Block Bolts Subaru WRX 2002-2014 / STI 2004-2021 / Legacy GT 2005-2009

Part #: 260 - 5401. ARP's Subaru EJ20, EJ25, and EJ257 Main Bolts are made from 8740 forged chrome moly. They have a large under - head radius and rolled threads, ensuring top - notch reliability. The threads are rolled after heat - treatment, giving them 1000% longer fatigue life than regular bolts. Paralell - ground hardened washers are included. These through - bolts fit the crankcase of all EJ series motors and are suitable for 04 - 08 Forester XT, 02 - 14 Subaru WRX, 05 - 09 Legacy GT, 05 - 09 Outback XT, and 04 - 20 STI.

Using these ARP main and block bolts is straightforward. First, make sure the crankcase area is clean before installation. Just place the bolt in the correct position and use appropriate tools to tighten it. Remember to put on the included paralell - ground hardened washers. When it comes to maintenance, regularly check the bolts for any signs of wear or looseness. If you notice anything unusual, it's a good idea to replace the bolts. Also, don't overtighten the bolts during installation as this can damage them and affect their performance.