There's no single answer to the horsepower of a Ford 4.0L engine. The horsepower varies significantly depending on the year, model of vehicle it's in, and even the specific engine configuration (some had different calibrations for different applications). A 4.0L Ford engine from a 1990s Bronco will have considerably less horsepower than a 4.0L from a more modern vehicle (if they even still made one).
To find the horsepower, you need to specify the year and model of the vehicle the engine is in. Then you can look up the specifications in a repair manual, online automotive databases (like Edmunds or Kelley Blue Book), or a Ford parts website.
