ARP Case Bolt Kit Subaru EJ20 & EJ25

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Far superior to any other main bolt kit offered for use in competition engines, ARP main bolts are designed to meet the exacting standards and demands of professional engine builders. Forged from 8740 chrome moly, all bolts feature generous under-head radius and rolled threads for the utmost reliability. The threads are rolled after heat-treating, which makes them about 1000% longer fatigue life than most main bolts, which are threaded prior to heat-treating. Available in the popular High Performance Series, which, at a nominal rating of 180,000 psi, is a premium replacement for OEM fasteners, or the 200,000 psi nominal rated Pro Series, application-specific main bolts with reduced wrenching head and are designed for use in competition applications. Parallel-ground, hardened washers are included with each kit.

- OEM Spec
- Location = Case
- Material =  INCONEL 718
- All bolts undergo a generous under-head radius and heat treating for reliability
- Threads are rolled after heat treating to make them 1000% stronger than most other main bolts
- Bolts are rated at 200,000 psi
- Includes parallel-ground, hardened washers
- Some engine builders recommend line honing the case to remove any distortion created by the hardware
- Use OEM SUBARU torque specs and procedures, any other torque specs and lubricants may lead to case distortion damage.

- 14 x Bolts
- 11 x Washers

2002-2007 WRX
2004-2007 STI
2008-2014 WRX
2008-2014 STI
2015-2021 STI

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