When you are standing behind your car looking at your engine:
- Cylinder 1 is on the right hand side, closest to the front of the car;
- Cylinder 2 is on the right hand side again, closer to you.
- Cylinder 3 is on the left hand side, the closest to the front of the car
- Cylinder 4 is on the left hand side, closer to you.
On Type I and II at least, there is the number of the cylinder pressed into the metal on the tinware close to were the sparkplug leads end.