ARP Case Bolt Kit Subaru EJ Motors 2002-2014 WRX / 2004-2021 STI / 2005-2012 Legacy GT / 2004-2013 Forester XT

ARP Subaru EJ20, EJ25, & EJ257 Main Bolts are crafted from 8740 forged chrome moly and feature generous under-head radius and rolled threads for excellent reliability. The threads are rolled after heat-treating, giving them 1000% longer fatigue life than ordinary bolts. Paralell-ground hardened washers are included. These are crankcase through bolts for all EJ series motors.

Note: It is recommended to line hone the case when using ARP Case Bolts to remove any potential distortion created by the hardware.

Installation Guide