ARP 250-4202 Diesel Head Stud Kit

ARP is the industry leader when it comes to fasteners and manufactures heavy-duty head studs for a wide variety of popular diesel applications. Using 6.0 ARP 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 Ford 6.0 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 than Chrome Moly 8740. While 8740 and ARP2000 share similar characteristics, ARP2000 is capable of 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 Ford 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 times) 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 ARP Head Studs are a direct-fit for 2003-2007 Ford F-250/350/450/550 Super Duty, 2004-2010 Ford E-Series Vans, 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).