ARP

ARP 250-4201 DIESEL HEAD STUD KIT 1994-2003 FORD 7.3L POWERSTROKE


$599.99

  • PART #: ARP250-4201

ARP uses a premium grade 8740 alloy that is rated far superior to “aircraft” quality. Each stud is placed vertically in special racks and precisely heat-treated to 200,000 psi. This procedure ensures complete heat penetration! Following heat-treat, each stud is centerless ground to make it as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. It’s important to note that lesser quality studs are not even centerless ground – the material is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine). Because ARP studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned. ARP studs are thread rolled after heat-treat, which gives them about 1000% (that’s ten times) better fatigue strength than those studs that are threaded prior to heat-treat (a very common industry practice). 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.

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Head Studs vs Bolts:

On many street-driven vehicles, where master cylinders and other items protrude into the engine compartment, it’s probably necessary to use head bolts so that the cylinder heads can be removed with the engine in the car. For most applications, however, studs are recommended. And for good reason. Using studs will make it much easier to assemble an engine (especially a racing powerplant which must be serviced frequently and quickly!) with the cylinder head and gasket assured of proper alignment. Studs also provide more accurate and consistent torque loading. Here’s why. When you use bolts to secure the head, the fastener is actually being “twisted” while it’s being torqued to the proper reading. Accordingly, the bolt is reacting to two different forces simultaneously. A stud should be installed in a “relaxed” mode – never crank it in tightly using a jammed nut. If everything is right, the stud should be installed finger tight. Then, when applying torque to the nut, the stud will stretch only on the vertical axis. Remember, an undercut shorter stud will have a rate similar to a longer, standard shank stud. This provides a more even clamping force on the head. Because the head gasket will compress upon initial torquing, make sure studs and bolts are re-torqued after the engine has been run.

Brand ARP
Shipping Weight 13.2 lb.
Shipping Width 7.4 in.
Shipping Length 10.8 in.
Shipping Height 2.4 in.
Prop 65 WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
Year Make Model Engine
1994 Ford F-250 Powerstroke 7.3L
1994 Ford F-350 Powerstroke 7.3L
1995 Ford F-250 Powerstroke 7.3L
1995 Ford F-350 Powerstroke 7.3L
1996 Ford F-250 Powerstroke 7.3L
1996 Ford F-350 Powerstroke 7.3L
1997 Ford F-250 Powerstroke 7.3L
1997 Ford F-350 Powerstroke 7.3L
1999 Ford F-250 Powerstroke 7.3L
Year Make Model Engine
1999 Ford F-350 Powerstroke 7.3L
2000 Ford F-250 Powerstroke 7.3L
2000 Ford F-350 Powerstroke 7.3L
2001 Ford F-250 Powerstroke 7.3L
2001 Ford F-350 Powerstroke 7.3L
2002 Ford F-250 Powerstroke 7.3L
2002 Ford F-350 Powerstroke 7.3L
2003 Ford F-250 Powerstroke 7.3L
2003 Ford F-350 Powerstroke 7.3L

Diesel Dudes LLC is fueled by solid communication and proven performance in building diesel engines and trucks - honestly and expertly in Seattle.

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1420 S Henderson St
Seattle, WA 98108

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