However, common engine options for a 1997 F-150 were:
* V6 engines: These would have cylinders arranged in a "V" shape, typically with 3 cylinders per "bank" on either side of the engine block. The firing order would be specific to the engine, but the overall layout would be a V6.
* V8 engines: These also have a "V" shape, with typically 4 cylinders per bank. Again, the firing order is specific to the exact engine.
You need to determine the specific engine your truck has to get the precise cylinder location. Once you have the engine code, you can find a detailed engine diagram online.