July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Spark Plug Gap
Spark Plug Gap 4.0L 0.052-0.056 in. (1.32-1.42 mm) Spark Plug Gap 4.6L 3 valve v8 0.039-0.043 in. (1.0-1.1 mm) 4.6L 3 valve v8 spark plug gap is not adjustable.