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Ford uses Motorcraft Spark plugs on all there vehicles.
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.
on top of the motor
Does it have spark, fuel, compression?
.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)
.044 inch ( according to motorcraft . com )
( .044 inch ) according to motorcraft.com
It really depends on how fast you need the motor, and what type it is. I would suggest going to your local ford house and asking for an estimate.
ford F250 V8 5.8 motor
0.044 for both 4.9L V6 and 5.9L V8. According to www.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.