The cylinders are numbered sequentially from the passenger side (right side when looking at the engine from the front) to the driver's side (left). Therefore:
* Passenger Side (Right): Cylinders 1, 3, 5, 7
* Driver's Side (Left): Cylinders 2, 4, 6, 8
Remember that this numbering is based on the physical location on the engine block. The firing order (the sequence in which the cylinders ignite) is a different sequence entirely (typically 1-5-4-8-6-3-7-2, but can vary slightly depending on the specific year and application).