According to one of the Ford websites : For a 1988 Ford F-150 ( 4.9 litre inline six cylinder / 5.0 litre V8 / 5.8 litre V8 ) The spark plug gap is ( .044 inch )
for what size of engine ?
The proper spark plug gap for a 2001 Ford F150 4.6 V8 is .054"
The spark plug gap for a 1988 Ford Mustang is: .044" for the 2.3L 4-cylinder engine .054" for the 5.0L V8 engine
That would depend on which engine size you have
2001 Ford Truck F150 1/2 ton P/U 2WD 5.4L EFI 8cylThe Spark Plug Gap.054 (In thousandths of an inch)