Ford’s FE V8 powered nearly every brand in the lineup for eighteen years, from Fairlanes and Mustangs to the AC Cobra and the purpose-built Thunderbolt drag car, while NASCAR homologation rules forced Ford to keep pace on the street. A side-oiler fix born on the race track, industrial and marine applications, and a still-thriving aftermarket kept the engine relevant decades after Ford stopped building it. Read on to find out what actually separates an FE from its heavy-duty FT cousin.