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ARP Custom Age 625+ Head Stud Kit, VR38DETT - Nissan GT-R R35

Manufacturer: ARP
Product # {{ productPartNumber }}
In stock
Fast Lane Two Day Shipping

$ 966 18

Manufacturer: ARP
Product # {{ productPartNumber }}
In stock
Fast Lane Two Day Shipping
Product not eligible for promotional or discount codes.

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Description

It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all-out competition power plants. 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. 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 center-less 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 center-less 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 mostly 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, ARP Head Stud/Bolt Kits are the best on the market today, and the favorite of leading professional engine builders in all forms of racing.


High Performance Series

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head re-torquing. All High Performance Series bolts are 180,000 psi (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

Pro Series

All Pro Series bolts are cold-forged to ensure molecular integrity, heat-treated prior to thread rolling and machining, and are rated nominally at 200,000 psi. ARP Pro Series head bolt kits are application specific, designed for use with typically competition only components. These fasteners deliver superior strength and meet the ARP "ZERO defect, ZERO failure" quality standard. Hardened and parallel-ground washers are included with each kit to ensure even load distribution and accurate torque readings. All Pro Series head bolts have a reduced wrenching hex or 12-point head and wide area flange to eliminate the need for valve train removal for cylinder head re-torquing and permits the use of larger diameter valve springs. Most applications have undercut short bolts that can help eliminate head gasket failures through providing more "stretch" to compensate for the additional compression of gaskets.

Head Studs vs Bolts

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 torquing, make sure studs and bolts are re-torqued after the engine has been run.

Fastlane Terms & Conditions

CZP is proud to introduce our Fastlane premium delivery program! Fastlane provides free 2-day shipping for select items and brands, with no extra fees or memberships!

Look for the Fast Lane Two Day Shipping badge on product listings, or shop Fastlane products below. Just check out like normal, and select Fastlane Free 2-Day Shipping for your shipping method. If you place an order with a mixture of Fastlane and normal items, any Fastlane items will still ship 2-day, even if your other items are shipping Ground.

Shipping terms only include normal business days (Monday - Friday, excluding some holidays). Weekends are not included in shipping time estimates.

Fastlane is only available for shipments within the continental US. We cannot guarantee Fastlane service to PO Boxes, APO/FPO addresses, or other non-standard delivery locations.

Please note that orders must be placed before 2pm Local Arizona Time in order to be dispatched the same day. Orders placed after our shipping cut-off time may ship the following business day.

Fastlane items ordered alongside other standard items will still ship 2-day, even if you select Ground or 3-Day shipping for the order. On orders with a mixture of “standard” and Fastlane items, we may combine shipments at our discretion. This means that “standard” items may occasionally ship 2-day as well, but this is not guaranteed.

Because Fastlane is a free service, we make no guarantee regarding delivery dates or promise of compensation in the event a shipment is delayed, either due to carrier conditions beyond our control, or an unexpected lack of stock on product. We will, however, inform you as soon as possible of any anticipated delays in the rare event this happens. We will make every effort to get Fastlane items to you within 2 business days, and this is sometimes accomplished by splitting shipments, using specific shipping carriers/methods, or shipping from partner warehouses. We cannot guarantee Fastlane shipments will be sent by any specific carrier or method.

Compatibility

If you have questions about vehicle fitment, please contact us.

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