The gap for the 460 is .042-.046, I had a 1991 should be the same 99.9% sure.
spark plug gap on 1990 ford ranger 4.0?
.044 inch
My Chilton book shows ( .040 inch ) spark plug gap for a 1990 Ford Festiva 1.3 liter / 81 cubic inch 4 cylinder engine
The recommended spark plug gap is .044"
( .054 inch ) for the 4.0 L in a 1990 Ford Ranger - according to motorcraft.com
.044 inch
According to one of Fords websites : For a 1990 Ford F-250 , 5.0 / 302 cubic inch V8 engine : ( the spark plug gap is .054 inch )
how to install glow plug on ford f350 l997
The spark plug gap for a 1990 Ford Taurus 3.0L engine should be set at .044 inches. A 4.2 liter engine would have a gap between .052 and .056 inches.
According to one of the Ford websites : For a 1990 Ford Bronco 5.0 / 302 cubic inch V8 engine : ( the spark plugs are gapped at .054 inch )
According to one of Fords websites : For a 1967 Ford F-350 , 5.8 litre / 352 cubic inch V8 engine : ( the spark plugs are gapped at .035 inch )
.044 inch ( according to fordparts.com and therangerstation.com )