ARP Subaru EJ Series DOHC Custom Age Head Stud Kit

This ARP performance fastener, stud, bolt, tool, or assembly is the Subaru EJ Series DOHC Custom Age Head Stud Kit for 2004-2006 Subaru Baja. Confirm the exact engine or vehicle application, thread size, length, material, strength series, included quantity, installation lubricant, tightening sequence, and current ARP torque specification before ordering.

Key Features

• ARP Custom Age 625+ Alloy: Delivers 260000 psi tensile strength for sustained clamping force in boosted EJ engines.
• Stud Design: Minimizes thread wear on aluminum blocks while enabling accurate repeatable torquing.
• Matched Hardened Washers: Includes 12-point nuts and parallel ground washers for even load distribution.
• Lubricate with ARP Ultra-Torque for accurate torque values up to 75 ft-lbs.
• Custom Age 625+ alloy resists fatigue 5X longer than stock bolts.
• ARP proprietary Custom Age 625+ Inconel-based alloy with 260K psi strength black oxide finish for corrosion resistance.

Fitment

Specifications

What’s Included

One new ARP head stud & bolt kit in the exact configuration and quantity identified by this listing. Brackets, wiring, air lines, fittings, switches, fasteners, fitting kits, fluids, covers, and accessories are included only when expressly stated for this exact part.

About ARP

Automotive Racing Products manufactures high-performance studs, bolts, nuts, washers, wheel hardware, assembly tools, and installation lubricants for engine, drivetrain, chassis, and racing applications. Thread dimensions, material, preload method, lubricant, torque, and included quantity remain exact-part specific.

Important Disclosures

• California Proposition 65 warning applies. Review the current manufacturer warning before handling or installation.

Related Parts

• Shop all ARP products
• ARP 99+ Subaru EJ Series Phase 2 SOHC Head Stud Kit
• ARP Subaru EJ Series Press Fit Rod Bolt Kit
• ARP Subaru WRX EJ20 & EJ25 Head Stud Kit

Frequently Asked Questions

How do I confirm the Subaru EJ Series DOHC Custom Age Head Stud Kit fits my application?
Match the exact engine family or vehicle, component location, thread diameter and pitch, under-head length, material, strength series, and every current ARP application note.

Can I reuse the factory torque value with this ARP hardware?
Not automatically. Use ARP’s current instructions for the exact part, material, lubricant, tightening sequence, and preload method. Factory torque values may be based on different hardware and friction.

What is included with this ARP kit?
Only the studs, bolts, nuts, washers, lubricant, and tools expressly listed for this exact part number are included. Verify the required quantity before disassembly.

Installation Instructions

1. Confirm ARP part number 260-4704, the complete application, and every required supporting component before beginning work.
2. Clean and inspect all mating threads and components, then verify thread engagement, length, washers, nuts, lubricant, and required preparation before assembly.
3. Follow ARP’s current tightening sequence, lubricant instructions, torque or stretch method, and any retorque procedure for this exact part.
4. Verify clearance, preload, fastener seating, and normal component operation before returning the vehicle or engine to service.