When the last Power Stroke engine came out in 2003, it boasted very impressive numbers. The 6.0L V8 boasted over 300 HP and all the torque most of us could ever need and more. The powerplant, however, was plagued with problems out of the gate, and it took a couple years to get everything up to the Super Duty standard. New for the 2008 Super Duty is a twin-turbo 6.4L Power Stroke with 350 HP and 650 foot-pounds of torque. The engine was designed to meet or exceed tough new emissions standards, and the extra power keeps Ford competitive with its neighbors.
With a lot riding on this new money-making beast of an engine, quality had to be absolutely top-notch. To achieve the perfection Ford engineers sought, they racked up 10 million miles on the test tracks, on the dyno, and on the streets in real-world circumstances. Since a lot of people own trucks in places like Alaska, the Diesel Super Duty was tested climbing steep inclines with a heavy load at -40 degree temperatures. For the past 18 months or so, Super Duty pickups were all over the city of Dearborn and beyond. The new 6.4 Diesel has to be better than the outgoing 6.0L in every way, and with almost four years of testing and 10 million miles of testing, it's obvious Ford is taking the new Power Stroke very seriously.