The spark plug gap on a 1987 Ford F-250 should be set between .042 and .050 inches. Platinum spark plugs may work best for this vehicle.
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.
Ford uses Motorcraft Spark plugs on all there vehicles.
2001 Ford Truck F250 Super Duty P/U 2WD 5.4L EFI 8cylThe Spark Plug Gap.054 (In thousandths of an inch)
.044 inch , according to motorcraft.com
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 )
( .044 inch ) according to motorcraft.com
.044 inch
0.044 for both 4.9L V6 and 5.9L V8. According to www.motorcraft.com
1987 FORD THUNDERBIRD 2.3L 140cid L4 MFI Turbo (W) : Ignition : spark plug gap .034 3.8L 232cid V6 TBI (3) : Ignition : spark plug gap .054 5.0L 302cid V8 MFI (F) : Ignition : spark plug gap .050
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 )
.042 -.046 All you have to do is look at the emissions sticker under the hood.