SKU: 44455937608

ARP Head Stud/Bolt Kits

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Description

ARP Head Stud/Bolt KitsIt 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

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, 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 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 (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, 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.

CUSTOM AGE 625 PLUS®

This newly formulated super-alloy demonstrates superior fatigue cycle life, tensile strength and toughness – with complete resistance to atmospheric corrosion and oxidation. ARP is the first to develop manufacturing and testing processes for fasteners with Custom Age 625+. Best of all it is less expensive and expected to soon replace MP-35 as the material of choice in the high strength, super-alloy field. Typical tensile strength is 260,000-280,000 psi.

 

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 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. 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.

Shipping Notes
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 44455937608

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4.8 ★★★★★
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Patti VanGorden
West Palm Beach, US
★★★★★ 5
Pleasantly surprised at the size of this machine
Style: WF-7840, Set: DUAL TRAY (500 sheets)/FAX/ADF/PRINT/COPY/SCAN
This is an amazing printer!! I was surprised at how large it is because I assumed it was a smaller sized unit. I guess I didn’t check the dimensions before I bought it. That’s okay, though, I made room for it. Very easy to set up and connect to the internet. Print quality is awesome and the print/copy speed is great! Very happy with my purchase.
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Reviewed in the United States on April 25, 2026
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Verified Purchase
Gary
Chelsea, US
★★★★★ 4
Clean prints
Style: WF-7840, Set: DUAL TRAY (500 sheets)/FAX/ADF/PRINT/COPY/SCAN
Works well but a little slow. This could be only my internet connection speed through my router. I thought the 11x17 paper would fit fully inside one of the trays. It does not and hangs out as shown in the instruction manual which came with the unit. The initial ink cartridges are working well beyond their expected time.
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Reviewed in the United States on April 28, 2026
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Verified Purchase
William E Coleman
Pawtucket, US
★★★★★ 5
wi-fi connectivity appears to be fixed! Yay!
Style: WF-7840, Set: DUAL TRAY (500 sheets)/FAX/ADF/PRINT/COPY/SCAN
Updated: Connectivity has only failed once out of may prints! Yay! 5 stars if this keeps up! LEAVE THE FIRMWARE ALONE NOW! Updated again: This latest firmware update is an improvement. Up to 4 stars now: The printer has worked 2 times out of the last 3 prints. That is better than never working. Killing the Epson task and unplugging/plugging the printer is still the fasted way to fix when connectivity fails. Updated again: Every frequent firmware update makes the connectivity WORSE. Now the printer FAILS TO CONNECT EVERY TIME I PRINT. Right now the printer is installing yet another update. The notification says the firmware update is under SETTINGS. Yes, true, but 4 layers down so I end up searching and scrolling back an forth with every update. Why is it that the most used features are buried in the menus. Coder's revenge, I guess. The connection fails, the connection fixer thing asks a bunch of stupid questions and won't go away. Is the printer on? Did you change your router? Then is fails and suggests trying more stupid stuff. It should say: Use Task Manager to kill the running Epson task. Unplug the printer, then plug it back in. In 5 minutes, you will have your print. How convenient. EVERY TIME I PRINT. I expect this or the next FW update will kill even that. This is a beautiful mechanical machine with idiotic electronics and firmware/software. Updated review: This printer forgets who and where it is about once a week. The printer is only 6 feet from the Wi-Fi router. I have to run the Connection Checker program, answer irrelevant questions, reset the router, blah, blah, blah - the robot version of a customer support call. Make sure you also have an HP or Brother printer in case you need something printed right away when it hangs up. You will end up with an extra copy once the Epson wakes up. This is getting old. My HP printer never does this. My two Brother printers never do this. Epson finally came out with a mechanical masterpiece that always feeds and never jams. Now Epson needs to work on their interface design. I never thought Epson Connection Checker would be on my most-used software list. ---------- Original review: I really like this printer. I am not a photographer and I don't print t-shirts. The WF-7840 prints fast and feeds paper without jamming. That is more than I can say about the Artisan 1430 as a general purpose printer. This is a big printer, but if you have room for it, it is a very nice machine. It does so much that you will need the help file to do much of anything, but it will be there somewhere. I printed all of June, July, and August and part of September on the starter ink cartridges. I only use it for color prints. I have 3 laser printers for B&W prints. The WF-7840 only has ink 4 cartridges instead of 6 like the 1430. I am very happy with my purchase.
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Reviewed in the United States on September 12, 2021
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Verified Purchase
Jason K
Fort Morgan, US
★★★★★ 5
Jobsite Workhorse
Style: WF-7840, Set: DUAL TRAY (500 sheets)/FAX/ADF/PRINT/COPY/SCAN
Have had previous models of this printer and they have always been solid. We use them in our office trailers on our construction jobsites and this new version works excellent just as the previous series did.
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Reviewed in the United States on May 26, 2026
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Verified Purchase
Andrew Lierl
Grantham, US
★★★★★ 5
Excellent, as long as you don't update firmware
Style: WF-7840, Set: DUAL TRAY (500 sheets)/FAX/ADF/PRINT/COPY/SCAN
About 6 months in, and I am very happy with the performance of this printer. I loved that it collated multipage documents without being told to! I have denied every request for firmware updates, and I am pleased to report that remanufactured ink cartridges (pronounced "more affordable and just as good") work just fine. DO NOT UPDATE THE FIRMWARE. The updates only serve to make it impossible to use off-brand or remanufactured ink cartridges.
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Reviewed in the United States on April 21, 2026

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