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I was looking at one of the Ford websites :

For a 1978 Ford F-250 :

It shows .044 inch spark plug gap for all engines except the 4.9 liter /

300 cubic inch inline ( straight ) six cylinder engine

For that engine it shows .054 but I believe that is a mistake because

for 1977 and 1979 it shows the .044 inch spark plug gap

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12y ago

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