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 Pro Series Main Bearing Stud Kit (Part # 250-5802) delivers professional-grade bottom-end reinforcement for high-output engine rebuilds. In modified diesel engines subjected to extreme cylinder pressures, high torque loads, and aggressive fueling adjustments, the lower engine crankcase and main bearing caps experience massive vibrational and rotational forces.

Factory main bearing bolts can stretch under these severe cyclic loads, allowing main bearing caps to shift or "walk" across the bedplate interface. Main cap walk distorts main journal bores, pinches bearing shells, and disrupts critical oil clearances, leading to premature bearing failure or crankcase damage. ARP manufactures the 250-5802 kit from high-grade 8740 chromoly steel, heat-treated in-house to achieve a 190,000 PSI tensile strength. The threads are precision roll-formed after heat treatment to provide superior fatigue resistance. Complete with hardened washers and high-quality nuts, this kit locks the main caps firmly in place with zero core charge.

Key Features & Benefits

• 190,000 PSI Tensile Strength: Forged from premium 8740 chromoly steel to provide extreme clamp load and bottom-end structural rigidity.
• Eliminates Main Cap Walk: Prevents shifting and fretting of main bearing caps under heavy torque loads and high-horsepower diesel operation.
• Preserves Main Journal Roundness: Maintains true bearing clearance geometry to protect crankshaft journals and maintain proper hydrodynamic oil film.
• Roll-Formed J-Form Threads: Threads are rolled after heat treatment, yielding up to 10 times greater fatigue strength than cut threads.
• Protects Engine Block Threads: Stud design allows accurate torque preloading without wearing out threads inside the engine block during repeated servicing.
• Hardware Included: Ships complete with precision-parallel-ground hardened washers and high-strength nuts.
• Zero Core Charge: Brand-new outright bottom-end hardware kit requiring no core deposit or core return shipping.

Technical Specifications

• Manufacturer / Brand: Automotive Racing Products (ARP)
• Manufacturer Part Number / SKU: 250-5802
• Alternative Part Numbers: 2505802 / ARP250-5802
• Product Series: Pro Series Main Bearing Stud Kit
• Fastener Material: Premium 8740 Chromoly Steel
• Tensile Strength Rating: 190,000 PSI
• Thread Form: J-Form Rolled Threads (Post-Heat-Treat)
• Kit Contents:
  • Complete Set of Main Bearing Studs
  • Hardened Parallel-Ground Precision Washers
  • High-Strength Main Fastener Nuts
  • ARP Fastener Assembly Lubricant Pack
• 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
• Crankcase Preparation Tip: Clean and chase all main stud thread holes in the engine block thoroughly. Ensure no oil, debris, or cleaning solvent remains in the blind holes prior to stud insertion.
• Installation Tip: Thread main studs into the engine block hand-tight only. Liberally lubricate stud threads, washer faces, and nut mating surfaces with ARP assembly lubricant. Torque main nuts in progressive multi-step sequences according to ARP specifications. Always re-check main bearing bore alignment and clearances with a precision dial bore gauge after final torquing.