The obvious question is why Ford does not out source unitl they can get it right......??
Lets see...........6.0000000000, 6.4 not much better.......6.7, maybe, and I hope so, but their track record is pretty poor.
I am never proud of a poor decision, but that is just me.
GL
Early 6.4's had few issues but the rest are bullet proof motors the 6.7 is already provin its point as well. The 6.0 was a pos though