ARP Ecotec 2.0/2.2 Head Stud Kit
Part Number: LSJ-ARP-HSK
Shipping Weight: 3.00 pounds
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- 2005-2007 Cobalt SS with 2.0 or 2.2 engine
- 2004-2007 ION Red Line with 2.0 or 2.2 engine
Factory head bolts are 'torque-to-yield' bolts, intended to be used only one time, and then discarded. Instead of buying new factory bolts, we strongly recommend head studs. Studs provide for easier gasket and head alignment during reassembly, and more accurate and consistent torque loading. When you use bolts to secure the head, the fastener is actually being 'twisted' while it is being torqued to the proper reading. Accordingly, the bolt is reacting to two different forces simultaneously.
A head 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 using any Teflon-based thread sealant (NOT thread locker). Then, when applying torque to the nut, the stud will stretch only on the vertical axis. Because the head gasket will compress on initial torquing, make sure studs and bolts are re-torqued after the engine has been run
Our Head Stud Kits are manufactured by Automotive Racing Products (a.k.a. ARP). Simply stated, there is 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. Then, each stud is placed vertically in special racks and precisely heat-treated to 190,000 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 give them about 1,000% (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.
Clearly, these are the best head stud kits on the market today, and the favorite of leading professional engine builders in all forms of racing. Our kit comes complete with 10 head studs, 10 parallel ground washers, 10 nuts and a small packet of assembly lubricant.
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