NGK BUHX
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- B- Meaning it has a 14mm thread size and a 13/16" hex size
- U- Surface or Semi-Surface Discharge type plug
- H- 12.7mm (1/2") thread reach.
- X- Booster gap
This plug doesn't follow the normal nomenclature. It is the coldest plug in it's heat range. The next hottest plug would be the BUHW-2.