I was looking at one of the Ford websites :
For a 1978 Ford F-250 :
It shows .044 inch spark plug gap for all engines except the 4.9 liter /
300 cubic inch inline ( straight ) six cylinder engine
For that engine it shows .054 but I believe that is a mistake because
for 1977 and 1979 it shows the .044 inch spark plug gap
The spark plug gap for the 1979 Ford F250 is 0.044. This gap remains the same for the 1978 and the 1980 Ford as well.
( .035 inch ) is the spark plug gap
The spark plug gap is ( .044 inch )
.044
the gap is .044
( .044 inch ) according to motorcraft.com
0.045
Check the Vehicle Emissions Control Information ( VECI ) decal located in the front of your engine compartment ( it will show the type of spark plugs to use and the spark plug gap )
Most use a .045 gap.
Check the Vehicle Emission Control Information ( VECI ) decallocated in the front of your engine compartment ( it will show thetype of spark plugs to use and the spark plug gap )
.044 inch , according to motorcraft.com
2001 Ford Truck F250 Super Duty P/U 2WD 5.4L EFI 8cylThe Spark Plug Gap.054 (In thousandths of an inch)