However, a common convention (but not always followed consistently across all years and engines) is to number the cylinders from front to back on the passenger side (right side in the US) starting with #1 at the front. Then they continue to the rear of the passenger side, then to the front of the driver's side, and finally to the rear of the driver's side.
To know for certain:
* Consult your owner's manual: This is the most reliable source. It will have a diagram showing the cylinder arrangement.
* Look at the engine itself: Many engines have the cylinder numbers cast directly onto the engine block or cylinder heads. This is often easier to see from the top.
* Use an online resource: Search for "[Your F-150 Year] [Your F-150 Engine Type] cylinder numbering diagram". Websites specializing in automotive repair will likely have diagrams.
Without knowing the specific year and engine of your F-150, I cannot give you a definitive cylinder numbering scheme.
