Upgrade your 2003-2007 Ford 6.0 Powerstroke with an ARP 250-4202 Diesel Head Stud Kit. It’s a proven fact that OEM head bolts are the weak link in a diesel engine; especially if the engine has been modified. That’s because most engines are typically assembled from the factory using Torque-To-Yield (TTY) bolts and preloaded to yield and beyond (typically 100-110%). Any increases in combustion pressure can lead to problems like blown head gaskets or catastrophic engine failure and because TTY bolts are yielded by design, they should never be re-used.
ARP is the industry leader when it comes to fasteners and manufactures heavy-duty head studs for a wide variety of poplar diesel applications. Using head studs instead of standard head bolts provides your engine with the clamping force required to keep your cylinder heads from lifting and blowing a head gasket due to higher combustion pressures. For the 250-4202 Head Studs, ARP starts with a premium grade ARP2000 alloy that is rated far superior to aircraft quality alloy steels. ARP2000 is an alloy steel that can be safely heat treated to a higher level, producing a greater strength material that Chrome Moly 8740. While 8740 and ARP2000 share similar characteristics, ARP2000 is capable if achieving a higher clamp load at 220,000 psi.
Each stud is placed vertically into special racks and precisely heat-treated. This procedure ensures complete heat penetration and the results are far superior to those lesser quality 6.0 head studs from other manufacturers who just dump pieces in a basket and hope for the best. ARP head studs then go through a centerless grinding process to ensure that they are perfectly concentric. As many as ten machining steps are required to achieve this level of accuracy. The thread rolling operation (to MIL-S-8879A specs) is also done after the heat-treatment, which gives them about 2000% (that’s twenty timers) better fatigue strength than lesser studs that are threaded prior to heat-treat. It costs a lot more to do it this way, because it’s tough on tooling, but the results are well worth the extra effort. Fasteners are then shot-peened to remove any surface irregularities and improve overall external integrity. The final step is a metal finishing process that is also performed in-house at ARP with a black oxide coating applied for long lasting corrosion resistance.
There is a good reason that virtually every top professional engine builder relies on ARP head studs for their all-out competition powerplants. Simply put, there’s not a better stud setup on the market today. These 6.0 Powerstroke Head Studs are a direct-fit for 2003-2007 Ford F-250/350/450/550 Super Duty pickups as well as the 2003-2005 Ford Excursion. ARP also offers Inner Row Head Bolts as an add-on to compliment this head stud kit (sold separately, see related items below).
Proprietary ARP 2000 Material
Rated At 220,000 PSI Tensile Strength
Includes Chrome Moly Steel 12-Point Nuts
Black Oxide Coating For Added Corrosion Resistance
Centerless Ground To Ensure They Are Perfectly Concentric
Improved Clamping Force Prevents Cylinder Head Removal Easier
Heat-Treated Prior To Thread Rolling And Machining For Optimum Fatigue Strength
Shot-Peened To Remove Any Surface Irregularities And Improve Overall External Integrity
Hardened Parallel Ground Washers For An Even Load distribution And Accurate Torque Readings
Comes With 0.5oz of ARP Assembly Lubricant
Note : ARP is aware of forum postings providing incorrect torque values. Please follow the included installation instructions for proper torque specifications and tightening sequence.