ARP EJ Main And Block Bolts (260-5401) | Subaru WRX 2002-2014 / STI 2004-2021 / Forester XT 2004-2013 / Legacy GT 2005-2012 / Outback XT 2005-2009

The ARP EJ Main And Block Bolts (260-5401) are a premium fastener upgrade designed to replace the factory main and block bolts on Subaru EJ20 and EJ25 engines. Manufactured from high-strength materials and engineered for precision and durability, this bolt kit enhances engine case clamping and reliability under high-stress conditions, making it ideal for performance builds, high-boost applications, and engine rebuild projects.

KEY FEATURES

• High-strength fasteners engineered for superior durability and reliability over OEM hardware
• Application-specific bolt set designed for Subaru EJ20 and EJ25 engines
• Precision-rolled threads and robust under-head radius for improved fatigue resistance
• Manufactured to exacting tolerances for consistent fit and performance
• Ideal for high-output and high-RPM engine builds where improved clamping force is critical

TECHNICAL SPECIFICATIONS

• Part Number: 260-5401
• Fastener Material: Premium high-strength alloy (heat treated for durability)
• Rated Strength: High tensile performance (designed to exceed OEM bolt capabilities)
• Application: Main bolts and case hardware for EJ20/EJ25 engines
• Included Hardware: Complete set of main and block bolts specific to EJ engine design
• Design Intent: Increase case clamping strength and long-term reliability under performance conditions

VEHICLE FITMENT

• Subaru WRX 2002–2014
• Subaru STI 2004–2021
• Subaru Forester XT 2004–2013
• Subaru Legacy GT 2005–2012
• Subaru Outback XT 2005–2009

PRODUCT NOTES

• This kit includes all main and block bolts designed for the EJ20 and EJ25 engine family; it does not include head studs or rod bolts.
• Installation requires removal of the factory bolts and should follow ARP and OEM torque specifications for proper clamping force and engine integrity.
• Use of recommended ARP assembly lubricant and torque sequence is highly advised for best performance and longevity.

ARP delivers precision-engineered, high-strength fasteners and hardware solutions trusted by professional builders, racers, and performance enthusiasts worldwide for uncompromising reliability, durability, and repeatable performance in demanding automotive and motorsports applications.