Spark Plug Gap

Spark plug gap 4.2L 0.052-0.056 inch (1.32-1.42mm)
Spark plug gap 4.6L 0.052-0.056 inch (1.32-1.42mm)
Spark plug gap 5.4L 0.040-0.050 inch (1.02-1.28mm)
The 5.4L 3 valve and 5.4L 3 valve FFV engine only, the SPARK PLUG GAP CAN NOT BE ADJUSTED