Check VECI label under hood!
gap is 42
5.4 eng spark plug setting is .052-.056
On the distributor cap
Check your underhood sticker, it should say.
.042 to .046 inch
( .044 inch ) according to fordparts.com
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.
.044 inch
whats the gap size for a 1985 e150 econoline conversion van (carbed) ======================================================= According to one of Fords websites : For a 1985 Ford E-150 : All engines have the spark plugs gapped at ( .044 inch ) * the HIGH ALTITUDE version of the 4.9 liter six , the spark plugs are gapped at .054
According to one of Fords websites : For a 1987 Ford E-350 , 7.5 L / 460 cubic inch V8 engine : The spark plugs are gapped at ( .044 inch )
# 1 on the distributor cap faces to the rear and slightly towards the drivers side on your 351 Ford
.034 inch ( according to motorcraft.com , one of Fords websites , for the 1980 Mercury Capri and 1980 Ford Mustang with the 2.3 liter )