Not Ranked
Tim-
Personally, I've never been a big believer in plug differences...heat range and all that. Maybe for serious high compression race motors, but for our typical mills, not so much. Just my opinion, of course.
I use NGK BKR6E plugs gapped at .038". Works for me. It just seems like there are so many other things that make these motors run well or poorly, that plug choice should be WAY down at the bottom of the list.
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