I call

, what possible reason could GM have for doing this? Imagine what consumer reports would say if GM did do it. And since it is a new engine GM could have put in bigger bores if they needed the business end of the plug to be bigger.
I think this is a offshoot of the retarded urban rumor that if you break off the insulator (the white part) then you have to take the head off to get it out. This is also

, I've done this to my own cars twice and the METAL nut that the socket grabs is still there.
In closing:

.