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Where is the number 6 spark plug on a 2005 f250 5.4l engine?

The 2005 F-250 5.4L engine uses a specific firing order, and plug #6's location depends on that order. There isn't a single "position" independent of the firing order.

You'll need to consult a repair manual, a detailed diagram for your specific engine (5.4L Triton), or an online resource that shows the firing order and corresponding plug locations for that engine. These resources will show the plugs numbered 1-8, and you can locate #6 from there. A Haynes or Chilton manual would be a good starting point. Don't rely on a generic image as the arrangement can vary slightly.