I know that is the common norm, but why exactly? Is it just to clean out the trapped crap, or to gain more thread engagement by cutting deeper threads?
I think I can make a case if the stud is already screwed into its last thread, cutting more threads in a taper tapped existing hole with a bottoming tap will only weaken the block.
I've never seen a set of ARP main studs, or head studs, screw in all the way without bottom tapping all of the holes. My guess is that ARP designed their studs for fully threaded holes but I don't know for sure. In any case, Mopar blocks need to be bottom tapped if a person is going to use ARP studs.
