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stock is .45 on the 5.2....

so yeah, depending on the plugs. A conservative gap would be .50-.55

You can always try taking one plug and expanding the gap, putting it back in, and then run it until you feel the engine misfiring on that cylinder.

As soon as you find the limit on the plug, I would bring it back in .05
 
whoops. I've got mine gapped .10 too far then as of last week.

I'll get those back to .35 tomorrow!
 
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