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What is correct spark plug gap for 5.4L engine?

The correct spark plug gap for a 5.4L engine depends entirely on the year, make, and model of the vehicle, as well as the specific spark plug used. There's no single answer.

The gap is specified in your owner's manual. If you don't have that, you should consult a repair manual specific to your vehicle's year, make, and model, or a reliable online source like a parts store website (e.g., AutoZone, Advance Auto Parts) that allows you to search by vehicle details. Entering your vehicle's information will show you the recommended spark plug and its gap.