Now in its fourth year, the No BS OBS Show N Swap is fast becoming the show ... A look under the rare Bronco's hood reveals a 5.9-liter Cummins diesel powerplant that replaces the original engine.

Rather than going for a GT500 or 3.5 EcoBoost swap, he opted to drop in a 12-valve Cummins diesel. The 12-valve is an iconic engine, originally used in farm equipment before its debut in the ...