6.6L Chevrolet Duramax LB7 LMM Head & Main Stud Combo Kit 2006-2010

Bought one on Amazon, tried it with multiple fasteners, and it didn't work with any of them. Reached out to Xotic customer service and they sent out a new one fairly quickly. Sadly, the second one didn't work, either. Normally I'd assume a bad batch but the original and the replacement look slightly different. No idea what to think here.

While installing head studs on my 12 valve Cummins I cross threaded one stud. I contacted XOTIC through email and paid the invoice online. Part arrived and my truck is up and running. I was very happy I didn't have to buy a whole set. Thank you. Excellent customer service.

Worked great

Quick shipping, product well packed

Great kit, everything packaged and separated nicely. Install went flawless with no issue.

They look great ! I can’t wait to install them.

Like an idiot, I damaged the threads in my vehicle’s crankshaft when I went to remove the harmonic balancer, and I needed a way to repair those really important threads in my engine. Xotic Performance came through by being one of the only online providers of this particular tool. Not only was I able to easily repair the crankshaft threads but I was able to continue with my engine rebuild project. I couldn’t have done it without Xotic Performance.

Great product!!! Definitely as good if not better than ARP studs!

It’s a great tool and did the job

Thanks

Thanks

Looks great and fast shiping not install yet but look amazing and good price

Appearance, packaging and presentation are great. Minor issue with instructions, but easy enough to figure out if you look up the arp stud install instructions. My directions had 2 number 1 bolts and no number 7 in the torque sequence diagram. They seem to be a good alternative to ARP if you want something a bit more budget friendly. Time will tell.

Great people to work with been sponsoring my trucks on TikTok for a little while now 100% love there products

So far I'm impressed with them. I haven't installed them yet. Was a little concerned when I opened the shipping box and found 3 of the nuts out of the main box. But all was good.

I ordered before pulling my 2004 5.3 LS heads off. I take responsibility for the purchase. However, my particular motor out of a 2004 Yukon had the long studs in it so I was unable to use. Don't plan on returning as I have already opened the box, so they will sit for my next project or be sold on Market Place. Just take note, if you have a 2004 engine pull it apart before ordering to verify stud length.

The studs were great quality came with nice sockets and everything we will definitely be using them again at our shop

They have very good quality and arrived very quickly. I am super happy.

easy to install if not dumb like me, should have been a walk in the park watched vids and got her done.

Very high quality and are on par to th ARP bolts I looking at.

I have not had a chance to install yet as I am still assembling the motor. However I was extremely pleased with the fast shipping and neatness of the packing. Very professional

Looks good, have not used it yet.

Great product , great quality, fast shipping!

Worked as expected

Great shipping and packaging looks like a great product have not been able to install yet