Specifications
Part Details:
ARP Head Studs for the Subaru WRX and STI 2002-2012 are the standard upgrade for builds running increased boost, forced induction upgrades, or higher power targets where head gasket failure and cylinder lifting become real risks. Stock head bolts are not designed to handle sustained boost beyond stock levels, and ARP studs address that weak point directly.
This kit replaces the factory head bolts with premium alloy studs rated to 220,000 PSI, engineered specifically to keep the head clamped down under the cylinder pressure that comes with a built or boosted EJ257.
Key Features
- Premium grade alloy material for superior fatigue cycle life
- 11mm stud profile
- Heat treated to 220,000 PSI tensile strength
- Thread-rolled for 1000% better fatigue strength than cut threads
- Resistant to atmospheric corrosion and oxidation
Included Components
- (12) head studs
- (12) 12-point nuts
- (12) washers
Important Installation Notes
- Engine disassembly required: Head stud installation requires removing the cylinder head, which is typically done alongside other engine build or gasket work rather than as a standalone install.
- Torque specifications: Follow ARP’s specific torque procedure and lubricant recommendations included with the kit. Improper torque sequence can lead to uneven clamping load.
- Fitment: Confirm exact engine code and year before ordering. Always verify fitment for your specific build.
Recommended Supporting Components
- Gaskets and Seals – head gasket replacement is required alongside any head stud upgrade.
- IAG Short Blocks – head studs are commonly installed as part of a complete short block build.
- WRX Engine Build and Power Goals Guide – plan the full engine build path for higher boost and power targets.
Frequently Asked Questions
Do I need ARP head studs for a stock power WRX or STI?
For stock or mildly modified builds running low boost, factory head bolts are generally adequate. ARP head studs become important once boost increases significantly, especially on builds approaching or exceeding 350 to 400 whp, where the risk of head lifting and gasket failure rises sharply.
Can I install ARP head studs without removing the engine?
The cylinder head must be removed to install head studs, but this does not require pulling the full engine. It is most commonly done alongside head gasket replacement or other top-end work.
What torque spec should I use for ARP head studs?
Follow the specific torque sequence and ARP lubricant included with the kit. Torque specs vary by application, and using the wrong lubricant or sequence can result in uneven clamping load across the head.
Are head studs required for a built short block?
Head studs are strongly recommended on any built short block, since the increased power potential of a built engine puts more load on the head gasket seal than stock head bolts are rated to handle.
Why Buy ARP Head Studs from Wrench Masters?
Wrench Masters specializes in Subaru WRX and STI engine builds. When you purchase ARP Head Studs from us, you get:
- Fast shipping on in-stock engine hardware
- Guidance on torque specs and installation sequencing for your build
- Support for fitment questions across WRX and STI engine codes
- Access to a full catalog of WRX and STI engine build components
Head studs are one of the most important upgrades on any boosted or built Subaru engine. The Wrench Masters team can help confirm fitment and make sure the rest of the build is set up to handle the power before you buy.
Shipping
Shipping Options:
WrenchMastersAuto.com ships your performance parts safely, quickly and conveniently nationwide via the most trusted shipping carriers such as: UPS, Fed Ex, USPS, and DHL.
Delivery Times:
- In Stock: 3-7 Business Days
- Custom Orders: 2-6 Weeks, Please Email: [email protected] or Call: 727-565-9808 for Questions.
Enjoy FREE SHIPPING on most orders over $199!
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Christian C (verified owner) –
I only use ARP for all my EJ builds. No issues so far, ever.