autoevolution 14 Jan 2021, 8:45 UTC · by When it left the assembly line in Wayne, the first generation of the Bronco couldn’t do better than 302 cubic inches (4.9 liters) for the larger of two small-block V8 engines and three forward ratios for either transmission. The 1972 model we’ll talk about today is a bit of a unicorn, though, because it marries a free-breathing Shelby powerplant to a five-speed manual tranny. 56 photos “Custom built for a collector of Shelby models that wanted a very special utility vehicle to accompany his car collection,” the Bronco in the photo gallery rocks 331 cubic inches and a four-barrel carburetor from Holley. The 5.4-liter motor delivers 421 horsepower and heaven only knows how much torque, which is a hairy proposition in such a high-riding vehicle.