* 4.2L V6: This was a smaller, less powerful option.
* 4.6L V8: A common and popular choice.
* 5.4L V8: A larger, more powerful V8.
There wasn't a single engine size for the entire model year. To know the exact engine size for a specific 2008 F-150, you'd need to check the vehicle's documentation (like the owner's manual or the vehicle identification number (VIN) sticker).