The ARP 250-4201 is the industry-standard heavy-duty cylinder head stud kit engineered for 1994–2003 7.3 Powerstroke diesel engines. Manufactured from ARP’s proprietary, premium-grade ARP 2000 alloy steel rated at an ultra-high tensile strength of 220,000 PSI, this kit replaces the factory torque-to-yield cylinder head bolts. ARP heat-treats every stud prior to precision centerless grinding and thread rolling, packaging the complete kit with hardened parallel-ground washers, 12-point nuts, and ARP Ultra-Torque fastener assembly lubricant.

Stretched factory head bolts, blown cylinder head gaskets, cylinder head lift, and combustion pressure escaping into the cooling system under heavy boost and high horsepower are what this kit solves. When running upgraded high-performance injectors, larger drop-in or T4 turbocharger setups, or aggressive ECM tuning, factory head bolts stretch beyond their elastic limit, breaking the fire ring seal on composite head gaskets. Installing ARP 2000 studs provides the immense, uniform clamping load required to keep cylinder heads anchored flat to the block deck under severe towing and competition demands. It is the cylinder head stud, nut, and washer kit only; cylinder head gaskets and engine oil are sold separately.

It fits all 1994–2003 7.3 Powerstroke Ford Super Duty trucks, OBS F-Series, Excursions, and E-Series vans.

Fitment

• 1994–1997 Ford F-250 / F-350 OBS 7.3L Powerstroke
• 1999–2003 Ford F-250 Super Duty 7.3L Powerstroke
• 1999–2003 Ford F-350 Super Duty 7.3L Powerstroke
• 1999–2003 Ford F-450 / F-550 Super Duty 7.3L Powerstroke
• 2000–2003 Ford Excursion 7.3L Powerstroke
• 1994–2003 Ford E-Series Vans 7.3L Powerstroke
• Navistar T444E diesel engines
• Manufactured from heat-treated ARP 2000 alloy steel rated at 220,000 PSI
• Precision centerless ground with rolled threads after heat-treat
• Includes hardened parallel-ground washers and 12-point nuts
• Supplied with ARP Ultra-Torque fastener assembly lubricant
• Complete cylinder head stud kit only

Thoroughly chase and clean all female head bolt holes in the engine block using a thread chaser or bottoming tap, blowing out every blind hole completely dry of residual oil, coolant, and debris with compressed air. Thread the studs into the block hand-tight only using an Allen wrench in the top internal hex socket—never torque studs into the block deck. Liberally coat the upper exposed stud threads, washer faces, and nut mating surfaces with the supplied ARP Ultra-Torque fastener assembly lubricant, then torque the 12-point nuts in the factory spiral pattern across three equal, progressive stages up to ARP's final recommended torque specification.