ARP 144-3605 Head Bolt Kit
Specifications
Condition:
New
UPC:
672036032494
SKU:
276957
Brand:
ARP
Manufacturer Part #:
144-3605
Condition:
New
UPC:
672036032494
SKU:
276957
Brand:
ARP
Manufacturer Part #:
144-3605
Head Bolt Kit High Performance 8740 Series Hex Head 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, theres 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 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. Its 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 wont happen with inferior quality head studs. ARP studs are thread rolled after heat-treat, which gives them about 1000% (thats 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 its 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 wont 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 retorquing. 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 retorquing 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, its 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 powerplant 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. Heres why. When you use bolts to secure the head, the fastener is actually being twisted while its 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.
Cut to Fit
No
Fastener Finish
Black oxide
Fastener Material
Chromemoly
Fastener Style
Bolt
Head Style
Hex
Quantity
Sold as a kit.
Washers Included
Yes
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Please see the "Shipping and Payment" tab or the top of the listing for shipping costs.
We ship within 2 business day(s).
We do not ship to APO/FPO or Post Office box addresses on eBay.
We use UPS and Fedex for most orders. We are unable to guarantee a specific carrier.
In-stock items can ship from multiple warehouses. To avoid delays, we ship the order from your nearest stocking warehouse. This means orders may arrive in multiple boxes or at different times.
We do not ship to Alaska, Hawaii, Puerto Rico or Guam on eBay.
Standard shipping is 1-5 business day delivery on most items.
Additional delivery days may apply in some instances, such as hazardous items, mounted tires and wheels, oversized items, truck freight items, select zip codes, Global Shipping Program and remote delivery areas.
Please see the "Shipping and Payment" tab or the top of the listing for shipping costs.
We ship within 2 business day(s).
We do not ship to APO/FPO or Post Office box addresses on eBay.
We use UPS and Fedex for most orders. We are unable to guarantee a specific carrier.
In-stock items can ship from multiple warehouses. To avoid delays, we ship the order from your nearest stocking warehouse. This means orders may arrive in multiple boxes or at different times.
We do not ship to Alaska, Hawaii, Puerto Rico or Guam on eBay.
Standard shipping is 1-5 business day delivery on most items.
Additional delivery days may apply in some instances, such as hazardous items, mounted tires and wheels, oversized items, truck freight items, select zip codes, Global Shipping Program and remote delivery areas.
We accept returns of new and unused merchandise if a return is requested within 30 days of shipment receipt. If the return is for a part that was used or damaged after it was received, or because of an error on the part of the customer, a restocking fee of 15-30% may apply. If the item(s) in question are being returned for a reason that is not our fault, the customer is responsible for return shipping costs as well as initial shipping costs on the order.
Please use the eBay returns portal to create a return. We respond within 24 hours and will provide you with all the simple information to send back your items. We pride ourselves in a simple return process
In the event that you have an issue with a product that falls under the manufacturer's warranty we can assist you in getting in contact with the manufacturer. Please contact us by phone or email so we can provide assistance.
Please note that in cases of items being replaced under warranty the customer may be responsible for the shipping cost of the return shipment and/or the replacement order.
If you find your shipment is lost, stolen or missing, you must go through our legally enforced return process. Please contact our team and notify them the item is lost, stolen or missing. You will be asked to sign a legal affidavit and we will then process the claim. Per legal policy, we must wait 7-10 business days before we can make a decision on the order status to await the items arrival. We will not process any lost, stolen or missing claims without a signed legal affidavit proving the item(s) were in fact lost, stolen or missing. If your item is found within the claim period, you will not be awarded the claim as your items have arrived. Any falsification of documentation can lead to further legal action.