Why ?
it is a pain ( impossible ?) to "bar" a 6.o unless you have the shroud off
but to Bar a motor over you put a breaker bar and socket on the center bolt in the crank pulley and turn the motor over with it
for certain things i just bump the starter but if it's checking for valve train resistance you are going to need to access the crank
some vehicles you can access the flywheel starter gear and put a special tool ( cheap) on the flywheel to turn the motor over but the 6.0 Auto has a full encompassing bell housing so that won't work
EDIT the personal cost to my lengthy post is Sbluke slides in here and satisfactorily answered the question in a simple few words :surprise: