Key Features & Benefits – ARP Subaru EJ20/EJ22/EJ25 DOHC Head Stud Kit
The ARP Subaru EJ20/EJ22/EJ25 DOHC Head Stud Kit is intended for Subaru EJ DOHC 2.0, 2.2 and 2.5 engines. On EJ20, EJ22 and EJ25 DOHC builds, the DOHC cylinder head layout and M11x1.25 block thread are the key checks.
The ARP Subaru EJ20/EJ22/EJ25 DOHC Head Stud Kit includes studs, 12-point nuts and washers. The studs are installed hand tight into the block, the hex broach at the end is there to help with installation and removal rather than final tightening, and ARP Ultra-Torque is used on the threads and under the nuts.
When is this useful?
This kit is useful when an EJ DOHC engine is getting a head gasket job, rebuild or engine build where clean washer seating surfaces, staged tightening and consistent preload matter.
Technical specs
- Compatibility range: Subaru EJ DOHC 2.0 / 2.2 / 2.5
- Common engine families: EJ20, EJ22, EJ25
- Block thread: M11x1.25
- Kit contents: studs, 12-point nuts, washers
- Assembly lubricant: ARP Ultra-Torque on the threads and under the nuts
- Tightening: 3 stages at 40.7 / 81.4 / 122.0 Nm (30 / 60 / 90 ft-lbs)
Selection & installation tips
- DOHC check: choose it only for an EJ engine with a DOHC cylinder head layout.
- Thread check: inspect the condition and cleanliness of the M11x1.25 block thread before assembly.
- Washer seating: keep the washer seating areas on the cylinder head clean and dry, without oil or grease.
- Tightening sequence: use the correct head tightening sequence and apply the 3 torque stages progressively.
- Engine ID: on an EJ257 or another 2.5L EJ variant, compare the head layout and thread size against the listed details.
Before installation, verify the EJ engine code, the DOHC cylinder head layout, the M11x1.25 thread, the washer seating surfaces and the tightening stages, then compare them with the listed details.
