ARP Pro Series Head Stud Kit 15-21 WRX / 14-18 Forester XT / 13-21 BRZ / FRS / GT86 | 8740 Chrome Moly Steel | High-Strength Engine Fasteners
Overview
The ARP Pro Series Head Stud Kit is a critical upgrade for Subaru WRX, Forester XT, and BRZ/FRS/GT86 owners looking to ensure maximum cylinder head retention and engine reliability under high stress. Designed to replace factory head bolts, this kit provides superior clamping force to maintain a consistent seal on the head gasket, especially important for performance builds, forced induction setups, or any engine subjected to increased cylinder pressures. Whether you’re rebuilding your engine or upgrading for peace of mind, these head studs are engineered to handle the demands of Subaru’s boxer engines.
Manufactured from premium 8740 chrome molybdenum steel, these studs boast an impressive tensile strength of 200,000 psi. ARP’s precision center-less grinding and thread rolling to Mil-S-8879 military specifications ensure exceptional durability and consistent fitment. The black oxide finish not only adds corrosion resistance but also reduces galling during installation. ARP’s reputation for quality and reliability makes this kit a trusted choice among Subaru enthusiasts and engine builders alike.
Upgrading to ARP Pro Series head studs delivers tangible benefits such as improved head gasket sealing, reduced risk of head warpage, and enhanced engine longevity. This is especially important for WRX and Forester XT owners running turbocharged setups where cylinder pressures are elevated. For naturally aspirated BRZ and GT86 owners, these studs provide peace of mind during track use or high-performance driving. Pairing this kit with a quality head gasket and considering timing belt replacement during engine service rounds out a comprehensive approach to engine maintenance and performance.
Features & Specifications
This ARP Pro Series Head Stud Kit is engineered for 2013-2021 BRZ/FRS/GT86, 2014-2018 Forester XT, and 2015-2021 WRX platforms and features 8740 chrome moly steel construction with 200,000 psi tensile strength. Constructed with precision center-less ground and thread rolled studs finished in black oxide, it delivers superior clamping force and durability for Subaru enthusiasts seeking reliable engine fasteners.
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Brand: ARP
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Product: Pro Series Head Stud Kit 15-21 WRX / 14-18 Forester XT / 13-21 BRZ / FRS / GT86
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Part Number: 260-4301
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Fitment: 2013-2021 BRZ/FRS/GT86, 2014-2018 Forester XT, 2015-2021 WRX
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Material: 8740 Chrome Moly Steel
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Finish: Black Oxide
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Construction: Precision Center-less Ground, Thread Rolled to Mil-S-8879 Specs
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Origin: Made in USA
Key Benefits
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Durability: High tensile strength steel ensures long-lasting performance under extreme engine conditions.
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Reliability: Maintains consistent clamping force to prevent head gasket leaks and engine damage.
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Fitment: Engineered specifically for Subaru boxer engines in WRX, Forester XT, and BRZ/FRS/GT86 for precise installation.
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Corrosion Resistance: Black oxide finish reduces galling and protects studs from rust and wear.
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Performance Support: Ideal for turbocharged and high-performance naturally aspirated engines requiring enhanced head retention.
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Quality Assurance: Manufactured to military-grade standards with ARP’s limited warranty backing.
What's Included
- 1× ARP Pro Series Head Stud Kit (complete set of studs)
- Hardened washers
- Premium grade nuts
- Installation instructions
Installation & Compatibility
Installation of the ARP Pro Series Head Stud Kit is moderately technical and recommended for those with engine assembly experience or professional mechanics. Proper torque sequence and specifications must be followed to ensure optimal clamping force and avoid damage. No special tools beyond standard engine rebuild equipment are required, but care should be taken to clean and prep threads thoroughly. This kit is a direct replacement for factory head bolts on specified Subaru WRX, Forester XT, and BRZ/FRS/GT86 models, ensuring OEM-level fitment without modification.
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Professional Installation: Recommended
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Modifications Required: None
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Verify Compatibility: Confirm fitment for your specific year and trim level before purchase
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