* 4.2L V6: This was a smaller, less powerful option.
* 4.6L V8: This was a more popular choice, offering a good balance of power and fuel economy (relatively speaking for a truck of that size).
* 5.4L V8: This was the largest and most powerful engine available.
To know the *exact* engine size for a specific 2003 Ford F-150, you'd need to check the vehicle's identification number (VIN) or the information plate located inside the driver's side doorjamb.
