ARP SB Chevy LS1 Pro-Series Hex Head Stud Kit
ARP SB Chevy LS1 Pro-Series Hex Head Stud Kit
ARP SB Chevy LS1 Pro-Series Hex Head Stud Kit 234-4110
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. *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.
Let customers speak for us
from 234 reviewsThe product was originally marked for 2005 and up gx470. I managed to fit it into my 2003 by flipping one of the front hanger mounts. Sound is throaty and deep a bit loud at first. But the sound has mellowed out after a few hundred miles. Hardest part was removing old exhaust had to use Sawzall. Make sure to buy the 2.5 donut gasket ahead of time. The system is high clearance. Its tucked between the frames no chance of hang ups.
It’s the best mod I’ve done. Should have been the first thing I did.
Brian was extremely kind and helpful to make sure I was getting set up with the correct products. The Brey Krause harness bar is extremely high quality. Don’t cheap out on safety stuff this is definitely the harness bar you want in your c5. The combination of great service from Brian and the quick arrival I highly recommend FI Performance and will definitely be using them in the future!
Five stars for the parts and service. Ride quality is better than expected for a coilover setup. And Brian was super helpful in getting the correct setup for my truck
Fits perfectly and does exactly what it needs to do. No complaints.
Brian recommended these end links after sharing my plans to do some HPDE, Autocross and Street driving for the C5 Z06. The parts feel great, I did have a warranty issue that was addressed by both Brian and AFE, I was very satisfied that they took care of my issue in a timely manner as well. Highly recommend both Brian and AFE, thank you as always for your help!
Brian definitely knows his stuff, he recommended these after asking what my plans were for the car. This is a huge upgrade to my C5 Z06 and the ride quality is tight and feels great!
Came packaged well, looks great fit as it should. Much better than other cabon hoods I have bought in the past. Brian's customer service and willingness to assist is second to none!
I purchased a kit from Brian with Swift springs. I must say that the quality, fitment and easy install was awesome.
Beeing a racercar driver I have dealt with many sorts of coil over kits. I have also attended to several car/racecar projects. So my experience with coil over systems is wide. Like Reigers from wrc, Øhlins, Team Dynamics etc etc..
The installation is easy but use time to do things properly.
Very lightweight but also seems very well built dampers.
It is easy to adjust height and stiffness. But I will recommend to do this very carefully and with some patience.
Brian is a very nice guy and very fast to answear questions. So thumbs up for him.
All in all I would highly recommend this product. My Z06 did get a much better grip and feel in corners and the car became perfect on bumpy tarmac roads.
No need to scroll the internet for several different brands. This is a great value for the money to any use of your car.
Thanks again Brian for great service and a great product.
These have been great for me. I haven't taken them to the track yet, but they ride very nice and can go lower than you'll want to!
Great product and to top it off... excellent customer service. Thank you!
Shipped super quick, customer service is always fantastic. Mounts themselves fit great and will help put down all the power. Paired with their engine mounts it will add some NVH, but nothing extreme. I cant hear it over the bald eagles anyways
Brian got me all fixed up I was having a lot of trouble getting this oil pan locked down from other places and he was able to get me the full story on why it was so difficult to get but he got me on the list for one and got it in about two weeks including production time this place is great!
Great service and customer service
Quality was top notch. Install and fit was perfect. Thank you to Brian for going out of his way to get these to me.