This brings us to one of the most common reverse upgrades done to customize a '56 Ford F-100 since the trucks first hit the showroom floors. There were two ways that a V-8 powered '56 could end up with the cleaner appearing six-cylinder grille. In the early days when the trucks were new, or near new, typically the owner bought a base model six-cylinder truck, and then swapped-in a Cadillac, Oldsmobile, or Buick engine. In the case of a '56 that left the factory equipped with a 272, the trick was to round up a six-cylinder grille and stuff it in. Of course the proper terminology is to install it, and that's what we're going to do here on my Y-block powered '56 Big-Window.