* 2.9L V6: A smaller, fuel-efficient option.
* 4.9L I6: A straight-six engine known for its durability. This was a popular choice.
* 5.0L V8: A larger, more powerful V8 engine. This was also a very common option.
* 5.8L V8: The largest engine option available, offering significant power.
To know the exact engine in a *specific* 1989 Ford F-150, you'd need to check the vehicle's identification number (VIN) or the engine bay itself. The engine block typically has a casting number that indicates its displacement.