Description:
ARP 8740 High Performance Head STUDS. Now you can rest easy knowing that ARP & 3rd Strike Performance has your 4.7L covered! Now you can Run HIGH RPM/BOOST/NITROUS and know your heads will stay put!
ARP HEAD STUDS, 4.7L V8, Mopar, Jeep, Chrysler, Dodge, Kit
Details:
ARP’s Undercut Head Studs are manufactured from premium 8740 chrome moly steel and heat treated to 190,000 psi. These studs are thread rolled after the heat treating process, which vastly improves their fatigue tolerance. Undercutting of the stud equalizes the “stretch”, 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. Included are 12-point nuts and parallel ground washers. Also available are Undercut Head Studs With Hex Nuts.
ARP Pro Series cylinder head studs are cold forged to ensure molecular integrity. They’re heat-treated prior to thread rolling and machining. ARP Pro Series kits are also available with 12-point nuts, and all studs come complete with hardened parallel washers for an even load distribution and accurate torque readings. With hundreds of models ready to ship, these cylinder head fasteners can be ordered for virtually any style engine.
Part Type: Cylinder Head Fasteners
Product Line: ARP Pro Series Cylinder Head Studs
Fastener Style: Stud
Undercut Stud: Yes
Head Style: 12-point
Fastener Material: 8740 chromoly
Fastener Finish: Black oxide
Nuts Included: Yes
Washers Included: Yes
Quantity: Sold as a kit. – 20x studs, 20x Washers, 20x nuts
Modifications:
Head Studs Vs Bolts, Technical Discussion
ARP's factory Tech Representatives are often asked which is better, cylinder head studs or bolts. The answer, invariably, depends on the installation. On many street-driven vehicles, where master cylinders and other items protrude into the engine compartment, it's probably necessary to use head bolts so that the cylinder heads can be removed with the engine in the car.
For most applications, however, studs are recommended. And for good reason. Using studs will make it much easier to assemble an engine (especially a racing power plant which must be serviced frequently and quickly!) with the cylinder head and gasket assured of proper alignment. Studs also provide more accurate and consistent torque loading. Here's why. When you use bolts to secure the head, the fastener is actually being "twisted" while it's being torqued to the proper reading.
Accordingly, the bolt is reacting to two different forces simultaneously. A stud should be installed in a "relaxed" mode - never crank it in tightly using a jammed nut. If everything is right, the stud should be installed finger tight. Then, when applying torque to the nut, the stud will stretch only on the vertical axis. Remember, an undercut shorter stud will have a rate similar to a longer, standard shank stud.
This provides a more even clamping force on the head. Because the head gasket will compress upon initial torqueing, make sure studs and bolts are re-torqued after the engine has been run.
Dropships direct from manufacturer.
This product was added to our catalog on Thursday 27 February, 2020.
