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Part number: 201-4601
Product Details
ARP 201-4601 Head Studs
Products specifications
Cut to Fit No
Fastener Finish Black oxide
Fastener Material 8740 chromemoly
Fastener Style Stud
Head Style 12-point
Quantity Sold as a kit.
Washers Included Yes

Built for the BMW 2002... Obtaining the optimum cylinder head-to-block sealing is especially critical in small displacement engines employing high compression pistons or power adders like turbochargers, nitrous oxide and superchargers. That's why ARP head studs are popular among leading Sport Compact/Import racers.You should know that ARP uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality. Then, each stud is precisely heat-treated to 200,000 psi. Following heattreat, 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 something that won't happen with inferior quality head studs.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.You will also note that ARP offers specially undercut studs for several engines. This procedure (done only to the shorter studs) more equalizes the "stretch" of both studs, which makes for a more consistent clamping force one that compensates for head gasket compression when the head is installed. This helps prevent blown head gaskets, and assures optimum sealing!

  • BMW 2002
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Fast shipping, great product.  Nothing more needs to be said.
Autoplicity was quick and easy. Painless web format. Shiped right away. And reasonably priced too.
Great communication, Great prices! They beat all the competitors hands down on price for my cold air intake order #18986.  Quick shipping and they are now in my favorites for places to look for automobile needs.  The only thing I would like to see them change is the speed of their website.
Good prices on products.  Response by email and phone.
BMW 2002
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