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!
FITMENT: Mini Cooper S R53 2002-2006
Part Number: 201-4301
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