Engineered specifically for 2011 through 2026 Ford F-250, F-350, F-450, and F-550 Super Duty trucks powered by the 6.7L Powerstroke V8 turbo diesel engine, the ARP 250-4301 Pro Series Head Stud Kit is the industry-standard benchmark for preventing head gasket failure on tuned and heavy-towing diesel builds. Under high boost, aggressive tuning calibrations, and sustained towing loads, factory torque-to-yield (TTY) head bolts stretch permanently, allowing the cylinder heads to lift off the engine block and breach the multi-layer steel (MLS) head gaskets.

ARP manufactures the 250-4301 kit from premium 8740 chromoly steel, heat-treated in-house to a massive 220,000 PSI tensile strength. Unlike cut threads, ARP's precision J-form threads are rolled after heat treatment, providing up to ten times greater cyclic fatigue resistance. Each kit includes parallel-ground hardened washers, high-strength 12-point chrome moly nuts, and ARP Ultra-Torque assembly lubricant with zero core charge.

Key Features & Benefits

• 220,000 PSI Tensile Strength: Manufactured from aerospace-grade 8740 chromoly steel to completely eliminate fastener stretch and head lift under high boost.
• Prevents Blown Head Gaskets: Delivers unyielding, uniform clamping force across the MLS head gaskets for maximum reliability.
• Post-Heat-Treat Thread Rolling: Precision J-form threads are rolled after heat treating to maximize fatigue strength and prevent thread stripping.
• Hardened 12-Point Nuts & Washers: Precision-machined, parallel-ground hardware ensures even load distribution and prevents galling against the cylinder heads.
• Protects Engine Block Threads: Stud design permits accurate torque preloading without wearing out threads inside the engine block during service.
• Zero Core Charge: Brand-new outright high-performance hardware kit requiring no core deposit or core return shipping.

Technical Specifications

• Manufacturer / Brand: Automotive Racing Products (ARP)
• Manufacturer Part Number / SKU: 250-4301
• Alternative Part Numbers: 2504301 / ARP250-4301
• Product Series: Pro Series Cylinder Head Stud Kit
• Fastener Material: Premium 8740 Chromoly Steel
• Tensile Strength Rating: 220,000 PSI
• Kit Contents: Complete Set of Primary and Auxiliary Head Studs, 12-Point Nuts, Hardened Washers, and ARP Ultra-Torque Lubricant
• Truck Platform: 2011–2026 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: ARP Limited Manufacturer Warranty

Vehicle Fitment & Technical Installation Notes

• 2011–2026 Ford F-250 Super Duty – 6.7L Powerstroke V8 Turbo Diesel
• 2011–2026 Ford F-350 Super Duty – 6.7L Powerstroke V8 Turbo Diesel
• 2011–2026 Ford F-450 Super Duty – 6.7L Powerstroke V8 Turbo Diesel
• 2011–2026 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, 2026
• Thread Preparation Prerequisite: Meticulously clean and chase every blind threaded hole in the engine block using an M12 thread chaser and compressed air. Removing all oil, carbon, and sealant residue is critical to prevent fluid hydro-locking and block cracking.
• Installation Tip: Thread studs into the engine block hand-tight only. Liberally lubricate upper stud threads, washer faces, and nut mating surfaces with ARP Ultra-Torque lubricant. Follow factory Ford spiral torque sequences in incremental multi-step passes to achieve precise clamp load across the cylinder heads.