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 Pacific Performance Engineering (PPE) Heavy-Duty Head Stud Kit (Part # 318034800) delivers professional-grade clamping force to prevent blown head gaskets under high boost. In modern common-rail diesel applications running high-output tuning, upgraded turbochargers, and elevated fueling schedules, factory torque-to-yield (TTY) cylinder head bolts stretch permanently. This elasticity loss allows the cylinder heads to lift off the engine block, breaching the multi-layer steel (MLS) head gaskets and pressurizing the coolant recovery system.

PPE builds the 318034800 head stud kit to exceed factory specifications through rigorous manufacturing standards. Each fastener is precision centerless-ground and features threads rolled to strict Mil-S-8879 aerospace specifications, which optimizes fatigue life and eliminates stress-concentrating micro-fissures in the thread roots. Independently tested and verified to an impressive 231,900+ PSI tensile strength, these studs provide the unyielding clamp load required for heavy towing, drag racing, and sled pulling. Complete with parallel-ground hardened washers, high-strength flange nuts, and specially formulated fastener assembly grease, this kit installs with zero core charge.

Key Features & Benefits

• 231,900+ PSI Tensile Strength: Independently tested and verified high-strength alloy steel provides superior resistance against fastener stretch and cylinder head lift.
• Mil-S-8879 Aerospace Thread Rolling: Threads are rolled post-heat-treatment to aerospace standards, maximizing cyclic fatigue strength and thread root durability.
• Centerless-Ground Fasteners: Precision-machined shank and body ensure true straightness and even load distribution across every fastener.
• Prevents Blown Head Gaskets: Locks the cylinder heads firmly against the engine block to contain peak cylinder pressures under aggressive tuning and heavy loads.
• Hardened Flange Nuts & Washers: Thick, parallel-ground washers and high-strength nuts distribute torque evenly and prevent galling against the aluminum cylinder head casting.
• Specialized Assembly Grease Included: Includes custom high-pressure fastener lubricant to guarantee accurate, friction-corrected torque readings during installation.
• Zero Core Charge: Brand-new outright high-performance hardware package requiring no core deposit or core return shipping.

Technical Specifications

• Manufacturer / Brand: Pacific Performance Engineering (PPE Diesel)
• Manufacturer Part Number / SKU: 318034800
• Alternative Part Numbers: PPE-318034800 / PPE318034800
• UPC / GTIN: 840171222043
• Product Series: Heavy-Duty Pro-Series Cylinder Head Stud Kit
• Tensile Strength Rating: 231,900+ PSI (Independently Verified)
• Thread Specification: Mil-S-8879 Rolled Threads
• Kit Contents:
  • Complete Set of Engine Cylinder Head Studs
  • Hardened Parallel-Ground Precision Washers
  • High-Strength 12-Point Flange Nuts
  • Fastener Assembly Lubricant Pack
• 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: PPE 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 Cleaning Prerequisite: Prior to stud installation, chase and clean every threaded blind hole in the engine block with an M12 thread tap to remove carbon, oil, and sealant residue. Blow out each hole completely with compressed air to prevent fluid hydro-locking and block cracking.
• Installation Tip: Thread studs into the engine block hand-tight only. Lubricate the upper stud threads, washer faces, and nut mating surfaces generously with the included assembly grease. Follow the factory Ford spiral torque sequence, pulling the nuts down in progressive incremental steps until reaching final torque specification to ensure uniform clamping across the MLS head gaskets.