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I wasn't trying to be negative, it's just that I have spent too much time burning fingers, collecting lots of jets, needles etc. setting up my carbs and I never knew about removing the threaded portion and reading the base of the porcelain. I can get it in the ballpark but I guess the dyno is...
Some people say that to properly read a plug you need to cut the threaded portion off and examine the base of the porcelain.
https://www.motortrend.com/how-to/spark-plug-reading-101-dont-leave-hp-table/
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