According to one of Ford's websites :
For a 1987 Ford LTD Crown Victoria :
( 5.0 liter / 302 cubic inch V8 engine , .050 inch spark plug gap )
( 5.8 liter / 351 cubic inch V8 engine , .044 inch spark plug gap )
1987 FORD THUNDERBIRD 2.3L 140cid L4 MFI Turbo (W) : Ignition : spark plug gap .034 3.8L 232cid V6 TBI (3) : Ignition : spark plug gap .054 5.0L 302cid V8 MFI (F) : Ignition : spark plug gap .050
.044 inch
The spark plug gap on a 1987 Ford F-250 should be set between .042 and .050 inches. Platinum spark plugs may work best for this vehicle.
According to my Chilton's Auto Repair Manual : For a 1987 Ford Crown Victoria : ( .044 inch spark plug gap ) for the 5.0 / 302 and the 5.8 / 351
For example : The spark plug gap for the 460 cubic inch / 7.5 liter V8 engine in a ( 1987 Ford F-250 is .044 inch )
The recommended spark plug gap for a 1987 Volvo (all models) is .028"
the spark plug gap is .054in. for 2003 ford focus.
.042-.046
My 2002 Ford Focus ZX3 has a spark plug gap of .050" (1.3mm).
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.30 gap for 2013 Ford Focus Se