I was looking at fordparts.com and it shows ( .044 inch ) for all the factory
available engine sizes in a 1975 Ford F-100
no more than .035
( .044 inch ) according to motorcraft.com
According to one of the Ford websites : For a ( 1960 ) F-100 , 3.6 liter / 223 cubic inch six cylinder engine : ( .035 inch spark plug gap )
According to one of Fords websites : For a 1963 Ford F-100 with the 4.8 liter / 292 cubic inch eight cylinder engine : ( .030 inch spark plug gap )
fordparts.com shows .035 inch for two spark plug numbers and .030 inch for another spark plug number ( I believe the .030 inch is for heavy duty use )
the spark plug gap is .054in. for 2003 ford focus.
My 2002 Ford Focus ZX3 has a spark plug gap of .050" (1.3mm).
.035 inch ( light duty ) .030 inch ( medium duty ) according to fordparts.com
.30 gap for 2013 Ford Focus Se
The recommended spark plug gap for a 2003 Ford Expedition 4.6 is .054"
The spark plug gap for a 1983 Ford Ranger 2.8L is .044"
The spark plug gap for a 1998 Ford Explorer (V6 and V8 engines) is .054"