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ARP is second to none when it comes to fasteners. These worked great on my 6.7 Cummins. Install is a little work. Plan to adjust your rockers if you are performing a bolt to stud swap since you will have it apart anyway. It took about 5 hours to complete including the occasional break to rest the back and grab chow. I also replaced the rocker housing gasket with a new one. If you are a non-commercial owner of a Cummins (Dodge Ram etc), they you can register and find all the engine info you need at https://quickserve.cummins.com. You just need the serial number off the engine tag to register.
I have a 2007 Dodge Ram 2500 with the 6.7L Cummins. Wish I had retrofitted to these studs years ago, but I didn't. Head gasket failed at around 98k miles. I hired a mobile diesel tech to come to my house and help me change the gasket and install the studs. Ended up getting a valve job too, so the upper end of the engine is like new. It was a lot of work! This mechanic torqued the nuts to 135 ft-lbs, which is 10 ft-lbs higher than Cummins does at the factory. He says that is a best practice that many mechanics are doing.
For those who are replacing a failed head gasket, Cummins makes an Upper Engine Gasket Kit which has all the gaskets you'll need.