It is for good reason that virtually every top professional engine
builder relies on ARP Pro Series head studs for their all-out competition
Simply stated, there’s not a better stud setup on the market
For openers, ARP uses a premium grade 8740 alloy that is rated far superior to
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
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 2000% (that’s twenty 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.