[Formulajones]

Originally Posted by Scott65

I understand it's not an exact science. I can only judge from experience. That being 6 is approximately in the range of a 44, but maybe slightly hotter. But close. Agreed experimentation will be needed with a change in brands.

Yeah, I wish there was a more accurate way to compare heat ranges between plugs. If there is a chart, I sure haven't found it yet. I've just had to experiment and read plugs the old fashion way. I don't know if there is an industry standard as to what the manufacture considers a hot or cold plug either when it comes to their numbering systems. They seem to vary a bit.