To find out where cylinder 8 is located on *your* specific 5.4L engine, you'll need to:
1. Identify the engine manufacturer: Is it a Ford, GM, or another manufacturer? This is crucial.
2. Find the engine's specific model number: This number will be cast into the engine block.
3. Consult a service manual or online resource specific to that engine: A service manual will have a diagram showing the cylinder arrangement. Websites like forums dedicated to that specific vehicle model or engine may also have this information.
Without knowing the manufacturer and specific model number, it's impossible to pinpoint the location of cylinder 8.