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 )
no more than .035
( .044 inch ) according to motorcraft.com
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 )
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 1967 Ford F-100 , 352 cubic inch V8 engine : ( the spark plugs are gapped at .035 inch )
.035 inch ( light duty ) .030 inch ( medium duty ) according to fordparts.com
no plug on trans pan----u have to drop the pan
According to one of Fords websites : For the 5.0 liter / 302 cubic inch V8 engine in a 1978 Ford F-100 : ( the spark plugs are gapped at .044 inch )
The spark plugs on a Ford Explorer are replaced by first disconnecting the battery. Remove the spark plug using a spark plug socket. Replace with the factory recommended spark plug.
the spark plug gap is .054in. for 2003 ford focus.
The plug gap on a 1974 Ford truck is 0.035 inch (according to the Motorcraft Tuneup Guide). This information is also on Fords" www.motorcraft.com. Just look up your vehicle and the specifications are listed there. Plus any Ford parts counter can tell you.
My 2002 Ford Focus ZX3 has a spark plug gap of .050" (1.3mm).