ARP Mitsubishi Lancer Evolution X Head Stud Studs


It is for good reason that virtually every top professional engine
builder relies on ARP Pro Series head studs for their all-out
competition powerplants.

SKU: 207-4206 Category:


It is for good reason that virtually every top professional engine
builder relies on ARP Pro Series head studs for their all-out
competition powerplants. Simply stated, there’s not a better stud setup
on the market today. For openers, ARP uses a premium grade 8740 alloy
that is rated far superior to “aircraft” quality. Then, each stud is
placed vertically in special racks and precisely heat-treated to
200,000 psi. This procedure ensures complete heat penetration and the
results are far superior to those lesser quality studs from other
manufacturers who just dump pieces in a basket and hope for the best.

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 – 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 (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. 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 – and one that
compensates for head gasket compression when the cylinder heads are
installed. This helps prevent blown head gaskets, and assures optimum
engine sealing!

Premium quality heat-treated 8740 chrome moly steel head stud kits are
available for most every domestic and import applications. You won’t
find a better quality stud on the market from any other source. Look
for ARP stamped on each stud as your assurance of quality. Clearly,
they are the best on the market today, and the favorite of leading
professional engine builders in all forms of racing.

Product Notes


  • Head studs are to be torqued in 3 even stages using the supplied Moly Lube:
    • 30 Ft lbs
    • 60 Ft lbs
    • 90 Ft lbs

Additional information

Weight 7 lbs


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  • Mitsubishi Engine

    Mitsubishi Engine