As diesel-powered Ford pickups go, F-250 and F-350 rigs have been motivated by oil burners since as early as 1983, when a naturally aspirated, 6.9L, indirect-injection (IDI), International Navistar V-8 was offered as an optional powerplant. Those first diesels made a then-stout 170 hp and 305 lb-ft of torque, and put the F-Series in a

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