The 6.0 Navistar design was fine, it was only after the engine was "Fordized" that it had problems - the Navistar installations in trucks and other applications never had near the problems the Ford Super Duties had, an issue that was compounded by the fact that many Ford service departments lack the experiance to correctly work on them. The 6.4 was Navistar's update to the 6.0 design due to new EPA regulations. The basic engine is 100% Navistar and is used in Navistar trucks and other industrial applications. Ford took the Navistar design and "Fordized" it again to meet the higher specs for power ratings That's why it has a twin turbo (not found on any other Navistar application) to squeeze every last bit of power out of it so Ford can truthfully advertise it as the most powerful engine in its class in its commercials against Dodge and Chevy.
Ford was going to try to design its own light duty desiel engine for the F150 but its agreement with Navistar is exclusive preventing it from actually selling it. Given how slow Ford moves even if they have the design it will be 2011 before its ready for road tests anyway. Ford's recent money problems (along with declining truck sales) have probably cancelled the project anyway. Ford needed that engine in 1999, the market has already passed it by.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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