Here is some history per articles on the internet. I had those 6.4 diesels in my rollbacks back in 2006-2008. Never had the head gasket issue but for this who did it was a disaster. But some took the heads and fixed them and drilled bigger studs so the head would not warp or separate. I have been told when you do that thise things are bullet proof and you can get big power out of them.
My 2022 Tremor F-250 has the diesel with 475hp and 1050 torque
After just four years, Ford replaced the 6.0 with a 6.4-litre Power Stroke engine, still built by Navistar. It made 350hp and 650lb ft of torque, and was believed to be free of the problems that plagued the 6.0. However, it never really shook off all the demons from its predecessor. The reliability was improved over the 6.0, but it still wasnât particularly great. In addition, the 6.4 had some pretty poor fuel consumption, especially for a diesel. It wasnât an awful engine per se, but the 6.4 never really gave Ford the chance to reclaim its reputation in the marketplace.
The 6.0 and 6.4 Power Strokes were so disastrous for Ford that they ended its partnership with Navistar in 2010, and began producing its own diesel engines. Not only was this a huge risk for Ford, it was an expensive one: Ford had to assume production of one of its best-selling engines. However, many truck enthusiasts will tell you that it was well worth the risk for Ford.
In 2011, the Ford Super Duty began using the 6.7-litre Power Stroke diesel, built in-house by Ford. Initially, it produced 390hp and 735lb ft. of torque. However, just one year later, Ford gave it a new turbo, which gave the 6.7 an astonishing 400hp and a teeth-numbing 800lb ft of torque. In 2015, even more changes bumped the 6.7 Power Strokeâs output to 440hp (almost as much as their Mustang GT) and 860lb ft of torque. For the redesigned, aluminum-bodied 2017 Super Duty, the Power Strokeâs power output remained unchanged. However, the peak torque increased to - get ready for this- - 925lb ft.
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