* 4.2L V6: This was a smaller, less powerful option.
* 4.6L V8: A more common and moderately powerful choice.
* 5.4L V8: A larger, more powerful V8 engine.
You can find the engine size on:
* The sticker on the driver's side doorjamb: This will list key information about your truck, including the engine.
* Your vehicle's title or registration: This documentation will often list the engine displacement.
* The owner's manual: This manual will specify the engine size for your particular truck.
Without more information about the specific 2004 Ford F-150, it's impossible to say definitively which engine it has.