It's a damn shame they seem to not be able to get those right. Otherwise the 6.4 seems pretty solid. Is that a truck or car engine? I understand they're different, but both seem to suffer cam/lifter issues, or maybe it's lifter issues, and the cam is the victim. Ford and GM have their share of related issues as well.. we're getting ready to start ordering RAM (Cummins) trucks at work because these Ford gas trucks are low bid junk; won't order RAM gas trucks because of the lifter issues. I know a guy that had his engine gone through twice for the lifter problems and that's even with swapping the MDS lifters out for "Hellcat" (in other words non-MDS) lifters, still managed to crap out on him again.
Richard