OBSPowerstroke wrote:
Due to the poor reputation of the 6.0 and 6.4, Ford decided to take the motor in house and designed and built the 6.7 that premiered in 2011 and is still in use today.
The 6.7 was under development before the 6.4 had any reputation. I think it's more than likely that Ford had the 6.7 in development because of the lawsuits with Navistar in respect to the 6.0.
The main issue with the 6.4 is the DPF. The first generation DPFs for all brands were pretty horrible.
Also, if you read Ford-trucks in the time frame of 3-4 years ago, you'll know there was a split between which engine people preferred between the 6.4 and 6.7. I know that's the case, and I've pointed that out on Ford-trucks. All you need to do is a few searches to validate. Otherwise, I would have gone 6.7.
The 6.4 will never have the following of the other engines since it was not produced as long. Sure, there are a few people out there that absolutely hate the 6.4, but it's revisionism at it's best. Again, read about the the 6.4 with threads 3-4 years ago. The latest ones slant almost all negative for the hand full of people who still have one. :)