ARP ARP2000 Head Stud Kit - Subaru WRX EJ20 & EJ25

The ARP 260-4701 head stud kit is listed for Subaru WRX EJ20 & EJ25. The fasteners secure the cylinder head to the block; their application, installed length and preload must work with the chosen head and gasket arrangement.

Technical Highlights

• Manufacturer part number: 260-4701
• Application/configuration: Subaru WRX EJ20 & EJ25
• Material: ARP2000

ARP2000 is an alloy steel that can be heat treated to a higher strength level than 8740. This material choice does not establish a horsepower limit; fastener selection must also account for the application and required preload.

Selection Guidance

Fastener preload supplies the clamping force at the head-to-block joint. Gasket sealing also depends on suitable deck finish, component condition and the correct assembly procedure.

Match the engine and any specified aftermarket cylinder heads or block to the listed configuration. Do not assume that related engines use the same fastener dimensions.

Installation Considerations

Clean the block threads and cylinder-head washer seats. Install studs hand tight. Keep both washer faces and the head seating surfaces dry; apply ARP Ultra-Torque to the stud threads and underside of the nuts. Follow the tightening sequence and staged procedure supplied for this kit.

Vehicle Fitment