The Dieselsite STUD73 is a premium heavy-duty cylinder head stud kit engineered for 1994–2003 7.3 Powerstroke diesel engines. Manufactured from ultra-high-tensile aircraft-grade alloy steel rated at a minimum tensile strength of 220,000 PSI, these studs provide the extreme clamping load needed to keep cylinder heads anchored to the engine block deck. Dieselsite packages this complete hardware kit with precision centerless-ground studs, rolled threads, matching hardened parallel-ground washers, 12-point nuts, and high-pressure assembly lubricant.

Stretched factory torque-to-yield head bolts, blown head gaskets, cylinder head lift, and combustion gases pressurizing the cooling system under aggressive tuning and high boost are what this kit cures. When running larger aftermarket injectors, drop-in or T4 turbocharger upgrades, or heavy towing tunes, peak cylinder pressures easily exceed the elastic limit of stock bolts, allowing heads to flex and break the fire ring seal. Installing high-strength studs eliminates fastener stretch and maintains uniform clamping force across all cylinders under severe stress. 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
• Aircraft-grade heat-treated alloy steel rated at 220,000+ PSI tensile strength
• Centerless ground with precision-rolled threads
• Includes hardened parallel-ground washers and 12-point nuts
• Supplied with high-pressure assembly lubricant
• Complete engine head stud kit only

Chase and thoroughly clean all female block cylinder head bolt holes using a thread chaser or bottoming tap, blowing the blind holes completely dry of oil, coolant, and debris with compressed air before installation. Install the studs into the block hand-tight only using the broached hex drive on top—never torque or bottom out studs with force into the block deck. Liberally lubricate the upper exposed threads, washer faces, and nut mating surfaces with the supplied assembly lubricant, then torque the 12-point nuts in the factory spiral pattern across multiple progressive stages up to the manufacturer's final recommended torque specification.