Engineered specifically for 2011 through 2025 Ford F-250, F-350, F-450, and F-550 Super Duty trucks powered by the 6.7L Powerstroke V8 turbo diesel engine, the Gator Fasteners Heavy Duty Head Stud Kit (Part # HSK67F) delivers the clamping force necessary to seal high combustion pressures. In the 6.7L Powerstroke engine architecture, factory torque-to-yield (TTY) cylinder head bolts are designed to stretch permanently upon initial assembly. When the engine is subjected to aggressive tuning files, larger drop-in turbochargers, higher boost levels, and heavy continuous towing loads, extreme peak cylinder pressures (PCP) overwhelm the factory bolts' elastic yield limit. This leads to cylinder head deflection, combustion seal breach across the multi-layer steel (MLS) head gaskets, coolant pressurization in the degas bottle, and catastrophic engine overheating.

Gator Fasteners eliminates cylinder head lift by utilizing heat-treated 8740 chromoly alloy steel enhanced with proprietary hardening elements, elevating tensile strength beyond 220,000 PSI. Each stud features precision-rolled threads formed after heat treatment, eliminating stress concentrations and micro-fissures in the thread roots to ensure superior cyclic fatigue resistance under diesel combustion pulses. Designed as a direct bolt-in replacement for factory head bolts, this complete top-end package includes all primary cylinder head studs, hardened parallel-ground washers, 12-point nuts, and high-pressure assembly lubricant with zero core charge.

Key Features & Benefits

• 220,000+ PSI Tensile Strength: Manufactured from proprietary-enhanced 8740 chromoly alloy steel to eliminate fastener stretch and cylinder head lift under high boost.
• Prevents Blown Head Gaskets: Delivers consistent, uniform clamping pressure across the MLS head gaskets to contain elevated combustion pressures from aggressive tuning and heavy hauling.
• Precision-Rolled Threads: Threads are rolled after heat treatment rather than cut, substantially improving fatigue life and preventing thread stripping inside the engine block.
• Hardened 12-Point Nuts & Washers: Precision-machined, parallel-ground washers ensure even clamping load distribution and prevent galling against the aluminum cylinder heads.
• Direct Drop-In Replacement: Engineered specifically for 2011–2025 6.7L Powerstroke cylinder heads and blocks with no machining or modification required.
• Assembly Lubricant Included: Comes pre-packaged with high-pressure assembly lube to guarantee accurate, repeatable torque preload without thread friction errors.
• Zero Core Charge: Brand-new outright high-performance hardware requiring no core deposit, no core return shipping, and no core inspection delays.

Technical Specifications

• Manufacturer / Brand: Gator Fasteners
• Manufacturer Part Number / SKU: HSK67F
• Alternative Part Numbers: GAT-HSK67F / GATHSK67F
• UPC / GTIN: 850027663044
• Product Series: Heavy Duty (HD) Series Head Studs
• Fastener Material: Proprietary-Enhanced 8740 Chromoly Alloy Steel
• Tensile Strength Rating: 220,000+ PSI
• Nut Style: Heavy-Duty 12-Point Flange Nuts
• Thread Type: Precision-Rolled Metric Threads (Formed Post-Heat-Treat)
• Surface Finish: Corrosion-Resistant Black Oxide Coating
• Kit Contents:
  • Complete Set of Engine Cylinder Head Studs
  • Hardened Parallel-Ground Precision Washers
  • 12-Point Heavy-Duty Flange Nuts
  • High-Pressure Fastener Assembly Lubricant
  • Detailed Step-by-Step Installation Instructions
• Truck Platform: 2011–2025 Ford Super Duty (F-250, F-350, F-450, F-550)
• Engine Platform: 6.7L Powerstroke V8 Turbo Diesel (Gen 1, Gen 2, and Gen 3 Platforms)
• Core Requirement: None
• Warranty: Gator Fasteners Limited Lifetime Warranty

Vehicle Fitment & Technical Installation Notes

• 2011–2025 Ford F-250 Super Duty – 6.7L Powerstroke V8 Turbo Diesel
• 2011–2025 Ford F-350 Super Duty – 6.7L Powerstroke V8 Turbo Diesel
• 2011–2025 Ford F-450 Super Duty – 6.7L Powerstroke V8 Turbo Diesel
• 2011–2025 Ford F-550 Super Duty – 6.7L Powerstroke V8 Turbo Diesel
• Fits Model Years: 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025
• Thread Preparation Note: Before installing studs, run an M12 thread chaser through every block hole to clean out old thread-locker, carbon, oil, and coolant residue. Blow out each bore thoroughly with compressed air—hydro-locking a stud in a blind hole can crack the engine block casting.
• Installation Tip: Thread the studs into the engine block hand-tight only (do not torque studs into the block). Liberally lubricate the upper stud threads, the washer faces, and the mating nut surfaces with the included assembly lubricant. Follow the factory Ford circular/spiral torque sequence and pull the nuts down in multiple progressive steps according to Gator Fasteners' instructions to achieve uniform clamp load across the cylinder heads.