- Most popular swap for 2003 F150.
- Direct bolt-in.
- Produces around 300 hp and 365 lb-ft of torque.
- Requires a new engine control unit (ECU), wiring harness, and transmission controller.
4.6L Triton V8:
- Smaller and lighter than the 5.4L V8.
- Produces around 260 hp and 300 lb-ft of torque.
- Easier to find in junkyards.
- Requires new motor mounts and possibly a new driveshaft.
Worked-up 5.0L Coyote V8:
- Most powerful option, but also the most expensive.
- Produces around 420 hp and 400 lb-ft of torque.
- Requires significant modifications to the engine bay, including new motor mounts, a new transmission, and a new ECU.
Ultimately, the best engine swap for your 2003 F150 depends on your budget and priorities. If you are looking for a relatively inexpensive and straightforward swap, the 5.4L Triton V8 is a great option. If you are willing to invest more time and money, the 4.6L Triton V8 or the worked-up 5.0L Coyote V8 are both excellent options.
