To know the exact cylinder numbering for *your* specific engine, you'll need to:
* Consult your owner's manual: This is the most reliable source.
* Examine the engine block itself: Look for stamped numbers on the block near each cylinder head.
* Find a diagram: Search online for a diagram specific to your year and model of vehicle with the 5.0L Windsor. Many online resources offer engine diagrams showing cylinder numbering.
Keep in mind that even with a diagram, aligning it to your engine physically is crucial due to possible variations.