* 3.1L V6: This was the most common engine.
* 3.4L V6: This was a less common, more powerful option.
There wasn't a single "size" motor. To know for sure which engine is in *a specific* 1997 Grand Am GT, you'd need to check the vehicle's documentation (owner's manual or vehicle identification number (VIN) information). The engine size will be clearly stated.
