ARP EJ 12-Point Cylinder Head Studs (260-4701) | Subaru WRX 2002-2014 / STI 2004-2021

The ARP EJ 12-Point Cylinder Head Studs (260-4701) are a performance-focused fastener upgrade engineered to replace the factory head bolts on Subaru EJ20 and EJ25 engines. Built for high-boost, high-power, and competition applications, these premium head studs deliver dramatically increased clamping force and sustained sealing performance under extreme combustion pressures, reducing the risk of head gasket failure commonly experienced with OEM hardware.

KEY FEATURES

• High-strength head stud kit engineered for Subaru EJ20 and EJ25 DOHC engines
• Premium 12-point nuts provide superior torque distribution and secure clamping
• Studs and hardware precision-manufactured for consistent fit and performance
• Enhanced fatigue resistance and tensile strength over OEM fasteners
• Complete kit includes studs, parallel ground washers, and 12-point nuts

TECHNICAL SPECIFICATIONS

• Part Number: 260-4701
• Fastener Material: High-strength ARP alloy (heat treated for durability and tensile capacity)
• Head Style: 12-point nuts for efficient torque application
• Included Components: 12 head studs, 12 washers, 12 12-point nuts
• Socket Size: 9/16″ 12-point and 4mm Allen application
• Design Intent: Increase clamping force and engine sealing reliability under performance and boosted 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 head studs, parallel ground washers, and 12-point nuts only; related engine hardware such as block and main studs are not included.
• Proper installation with ARP assembly lubricant and torque specification is critical for achieving the designed clamping force.
• Professional engine assembly practices and torque sequences are highly recommended for best results.

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.