Thoroughbred
Diesel is your source for ARP heads studs! The most
popular two selling part numbers are 247-4202
for the Dodge Cummins and 250-4202
for the Ford Powerstroke 6.0L. We basically
always have these part #'s in stock and ship your order
out the same day you order unless there is some sort
of national backorder. Fast free shipping, lowest price
online for ARP bolts and studs, all from a real diesel
shop that offers free advice.. Why shop anywhere else?
Thoroughbred
Diesel keeps an extensive inventory of ARP products
on hand at all times and sells them at the lowest everyday
price. ARP is your best choice for high performance
fasteners.
ARP is the undisputed world leader in automotive fasteners.
They manufacture every fastener, bolt and nut that the
world's top engine and chassis builders rely on in house.
ARP engineers ensure that every piece will outperform
any other fastener on the market today. That's why so
many top engine builders rely on ARP racing products to
hold their engines together.
To
overcome head gasket failures that can occur in diesel
engines employed in truck and RV applications, industry
leader ARP has introduced extra heavy-duty head studs
for the popular Ford, Dodge and GM power plants. These
ARP studs are rated at 220,000 psi tensile strength, and
provide the clamping force required to keep cylinder heads
from lifting due to higher combustion pressures. The studs
are manufactured in ARP's Santa Paula, CA plant from proprietary
ARP 2000 material, with threads rolled after heat-treat
to provide optimum fatigue strength. They are centerless
ground to assure perfect concentricity. The ends of the
studs are broached to facilitate easy installation. This
feature also enables the cylinder head to be removed in
tight quarters. Also included in each kit are heat-treated,
chrome-moly steel 12-point nuts and parallel-ground washers.
They are black oxide finished for extra durability.
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 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.
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!
Premium
parallel ground washers are also included with each
kit.
TECH
TIPS: HEAD STUD INSTALLATIONS
Clean
and chase all bolt threads in block to ensure proper
thread engagement and accurate torque readings.
All
hardware should be cleaned and inspected for possible
shipping damage prior to installation.
Since
most studs extend into the water jacket, coat threads
with ARP thread sealer and screw in hand tight ONLY.
Install
gasket and head, then lubricate washers and nuts with
oil or ARP moly assembly lubricant prior to their
installation.
Following
the engine manufacturer's torque pattern, torque each
stud nut three times to recommended values found in
the general fastener chart below.
NOTE:
To ensure positive sealing of "wet" head studs,
a hardening or semi-hardening sealant, such as Loc-Tite
or Permatex, etc. should be used. Some engine builders
employ a sealer in the coolant, such as Aluma-Seal, Silver
Seal or K&W sealer, etc. You may also use high temperature
RTV silicone. Whatever product is used, it is imperative
that the cylinder head is installed and torqued to proper
levels BEFORE THE SEALANT HAS CURED!
Torque
w/30-Wt Oil
Torque
w/ARP Moly-Lube
1/4in.
stud
12-15
10-12
5/16in.
stud
25-32
20-25
3/8in.
stud
45-56
35-44
7/16in.
stud
71-89
56-70
1/2in.
stud
108-135
84-105
9/16in.
stud
156-195
122-152
5/8in.
stud
214-268
167-208
6mm
stud
10
9
8mm
stud
25-32
20-25
10mm
stud
54-68
42-53
11mm
stud
80-100
63-79
12mm
stud
97-122
77-96
Choose
your Truck Below
Order
ARP
Ultra-Torque Fastener Assembly Lube
Gets
you within 5% of the required pre-load on the first pull
and stays consistent with each subsequent cycle-race prep,
machining, pre-assembly and final assembly. Premium grade
moly base with rust and corrosion inhibitors. Effective
lubrication range -30° to 550°F, with a load range
of 500,000 psi.
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