Can spark plugs be re-gapped?

I was in pinch and didn t have a gap gage with me when I changed my spark plugs, so I just kinda eye balled both plugs and tried to get the gaps in the new ones as close as I could to the old ones.

I finally got a gap gage and still had the old plugs around. Turns out the old plugs (factory plugs)
were gapped wrong. I have a ford 4.6l that calls for 0.055 inches, and most of the factory plugs are anywhere from 0.060 to 0.070, I think one was even at 0.090.

To finally ask my question, can these spark plugs be re-gapped?

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