Semi Truck Performance Exhaust Header Bolts

I purchased these in addition to the BBK shorty headers for a 2006 Dodge Ram 1500 Hemi 5.7. They just make sense to me. Once you tork them, use an allen wrench till you hear a click and they are locked making them impossible to back out. To uninstall just reverse the process. As far as the hardness of the bolts I was hoping for grade 8 but not sure. I think they are grade 5. In my installation due to the curve of the headers I was unable to get an allen wrench to the rear bolts on either side. I even cut some off the wrench but it wasn't enough room to get it in and turn so 2 of the 16 are unlocked. This is not the fault of the bolts but the shape of the headers.