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The 4BT is modern, compared to the F-head Willys or Flathead 6 that originally came in the FC's. While working the oil patch in the 70's, we had a couple of Mack 10 wheel dump trucks that were diesel, but one did not have a turbo..my goodness it was slow! There was an even older 50's something International without a turbo, but it's engine was HUGE, probably 8 feet long and the exhaust pipe was about 8 inches in diameter. Ah, the good old days!
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