Ford uses Motorcraft Spark plugs on all there vehicles.
The spark plug gap for a 1979 Ford F-250 with a 400 engine is between 0.42 and 0.46. This range is included in the factory settings.
( .044 inch ) according to motorcraft.com
Check the Vehicle Emission 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 )
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 )
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.
2001 Ford Truck F250 Super Duty P/U 2WD 5.4L EFI 8cylThe Spark Plug Gap.054 (In thousandths of an inch)
( .044 inch ) for the 5.8 L / 351 cubic inch V8 engine in a 1997 Ford F-250 , according to motorcraft.com
what is the spark plug gap on a 1997 ford thunderbird lx 3.8 engine
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
On the inline six cylinder engine , spark plug # 6 is the rear spark plug On the V6 engine , spark plug # 6 is the rear plug on the drivers side of the engine On the V8 engines , spark plug # 6 is the 2nd plug from the front on the drivers side of the engine
.044 inch ( according to motorcraft . com )