Well I got to learn something today! I guess the "Super Duty" moniker has it's roots way back in Buddy Holly's day...
Wonder what kind of MPG that 534cu/in beast got fully loaded?!
Of course, gas wasn't $3+/gal back then either...
I must be getting old, I remember riding to school in IH buses with manual transmissions and gasoline engines.
Hey, let's revive the 534 block, convert it to direct injection, turbo it, and see what we've got...this is an Ecoboost thread after all...