So I have a 2000 Ford Ranger XLT 4.0L V6 OHV Engine and I recently replaced the spark plugs. The thing is, the original recommended spark plugs have a gap of 0.52-0.56, which is what is recommended in the Haynes manual. However, I think some time between 2000 and now, the recommended plugs changed to another model, which is factory-gapped to 0.44.
The question I have is - which takes precedence? Should I be re-gapping these plugs to 0.54 because that is what is recommended in the shop manual, or should I be making sure the gap is 0.44 because that's what is recommended for these particular plugs?