ARP 201-4301 Head Studs
Cut to Fit
Sold as a kit.
(S Model - Stud Kit) Built for the (02-06) BMW Mini Cooper...
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 Mini Cooper (02-06)
- S Model - Stud Kit