So I started doing my head studs on my '16 CTD and have noticed that they are bottoming out at different depths based on the amount of threads above the nut.

I've been blowing out the holes, running the studs down until they bottom out, taking them out, and wiping them off to remove any oil that may be left in the threads and running them down again, finishing by backing out a half turn.

Looking at the pictures you can see what I mean that studs 5 and 7 have more threads.

Is this normal and just keep on going?

Also before anyone asks or suggests, no I did not get the longer 6.625" studs in the wrong place.