* 4.0L SOHC V6: This was the most common engine.
* 5.0L V8: This was a less common option.
To know for sure which engine is in *your* specific 1997 Explorer XLT, you'll need to check the vehicle's documentation (owner's manual) or look at the engine itself. The engine displacement (4.0L or 5.0L) will be clearly visible on the engine block.