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.

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SKU: 44455937608

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Carnegie, US
★★★★★ 5
Stunning Review
Format: Paperback
I thought the book was a great book. The book is about a man who is a journey to Santiago. But on his journey he encounters a lot of paths that he needs to over come. He has to dig deep down and find the true him and over come many things. The purpose of this trip is so he can become a new person and do many new things that he has not done before. This will bring out a new him and this will help him as he goes on in life after this journey. The thing in the book that got me noteworthy was how he had the drive and how focused he was to make it to the end of his task. The strength of the book was it was very detailed and this was a very good thing. The weakness of the book to me was I thought the ending was just a little dry, I felt as tho they could have added just a little more to it. I like the authors writing style this was very good on how he wrote it. It was well written the words all followed very well and his was a great thing. I think the message of the book is to show you that no matter how hard things may get never give up. There is always a road of something to come at the end of everything. I would recommend this book to anyone who likes a book about a journey or a path in someones life. I think it is good to read as a class because you really get to see what others think of the book together. I also think if you like a book about a person that is going thro something in life that this is a good book. The book just expresses so many trails and then he some how over comes everything. So if you like to read go head and buy the book.
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Reviewed in the United States on October 13, 2015
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Malcolm
Waukegan, US
★★★★★ 4
I very much enjoyed the book
Format: Paperback
Malcolm A. Ivy The book " The Pilgrimage" written by Paulo Chelho, is a story about one man on a quest to find his sword. During his journey he encounters multiple aids , hazards, and traitorous tribulations, that has him question not only his phish all capabilities, but his mental capabilities as well.Accompanying him on this journey is his guide Petrus, who leads him down the road to Santiago. Teaching him many different ram practices along the road. Throughout the book we see Paulo's overall character develop ,and mature through many vigorous challenges. I very much enjoyed the book, for both content and overall story arch.I enjoyed the progression of all the characters, and looking into their minds, and experiencing their inner most thoughts. The story is extremely detailed, and vivid. This book always kept me on edge to see wether Paulo does in fact get his sword, or not. The book however did ramble at times, but in a nutshell it was rather intertwining for a book about two guys walking. I liked this book for the underlying message stating that the most hardest questions, often have the simplest answers. I highly recommend this book if you want to kill some time. This book has a lot to offer, and will leave you questioning your self, and your own thought process. You would never want to put this book down because it keeps you in a stage of Suspense. Mostly , because it's a book you can take, and learn from. So if you are looking for a book that makes you reflect, this is the book for you.
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Reviewed in the United States on October 13, 2015
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Greg Martin
Dallas, US
★★★★★ 5
Great texture
These cleanser sponges have a nice texture, fairly rough but works great for men's skin.
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Reviewed in the United States on March 28, 2026
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Pygar
Lowell, US
★★★★★ 5
Nice and clean
So far so good. Does what it’s supposed to do and cleans the ole pores an removing dead skin. Lets see how long it’ll last, luckily you get 3 in the pack
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Reviewed in the United States on April 15, 2026
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gas
Lexington, US
★★★★★ 5
Excellent for face
Works great. Seems rough but after the first use it softens.
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Reviewed in the United States on January 24, 2026

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