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ARP Pro Series Main Bolt Kit Hex For 02-14 Subaru WRX/ 04-20 STi EJ205/EJ257
SKU:
260-5401
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- $507.99
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Take your Subaru EJ-series engine build to the next level with ARP Pro Series Main/Case Bolts. Engineered from premium 8740 chromoly steel and heat-treated for ultimate strength, these bolts are built to withstand the extreme forces of high-performance and forced induction setups. Featuring rolled threads after heat-treatment and generous under-head radii, ARP bolts deliver superior clamping force, fatigue resistance, and long-term reliability over stock hardware. Whether you're rebuilding a street motor or prepping for track duty, these main bolts offer peace of mind where it matters most.
Designed for Subaru Impreza WRX (2002–2014) and STi (2004–2020) models, these ARP Case Bolts are a direct upgrade for EJ20, EJ22, EJ25, and EJ257 engines. They're far more durable than OEM bolts that stretch over time, helping to prevent spun bearings and engine failure. Each kit includes parallel-ground hardened washers and hex head fasteners for precision and even torque distribution. For optimal results, professional engine builders recommend line honing the block when using ARP bolts to ensure perfect alignment and eliminate case distortion.
Features:
- Rated at 200,000 psi tensile strength for reliability
- 8740 chromoly steel construction resists stretching
- Rolled threads after heat-treating increase fatigue life
- Ideal for Subaru EJ20, EJ25, and EJ257 engines
- Includes hardened parallel-ground washers in kit
- Prevents main bearing shift and block distortion
- Designed for high-performance and boosted setups
- Direct OEM replacement for WRX/STi main bolts
Specifications:
- Main Bolt Style: 2-bolt
- Fastener Style: Bolt
- Head Style: Hex
- Works with Windage Tray: No
- Fastener Tensile Strength (psi): 200,000 psi
- Nuts Included: No
- Washers Included: Yes
- Quantity: Sold as a kit
Included:
- (1) Head Stud Kit
Fitment:
- 2002–2014 Subaru WRX 2.0L EJ205
- 2004–2020 Subaru WRX STi 2.5L EJ257
- 2006–2014 Subaru WRX 2.5L EJ255
- 2005–2009 Subaru Legacy GT 2.5L EJ255
- 2005–2009 Subaru Outback XT 2.5L EJ255
- 2004–2006 Subaru Baja Turbo 2.5L EJ255
- 2004–2013 Subaru Forester XT 2.5L EJ255
Note:
- Lifetime Warranty
Product Specs
SKU:
260-5401
Brand:
ARP
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