According to fordparts.com the 460 cubic inch / 7.5 liter V8 engine in a 1994
Ford F-250 has spark plugs that are gapped at ( .044 inch )
.035 inch ( for the 302 / 360 / 390 cubic inch V8 engines )
( .044 inch ) for the 5.8 L / 351 cubic inch V8 engine in a 1997 Ford F-250 , according to motorcraft.com
363 cubic inches
About 329 cubic inches.
183.071232 cubic inches ==
330 cubic inches
With out Year, transmision type and engine displacement there is no way to answer this question
Ford uses Motorcraft Spark plugs on all there vehicles.
3.8 liter = 231.89 cubic inches
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.
The Ford 4.0 liter V6 engine is (245 cubic inches )
The Ford 5.4 liter V8 is ( 330 cubic inches )