Originally Posted by
egobrkr
A OS P4 would be closer in heat range as the nova CT06 plug. If you ever decide to go back to a nova plug after using a OS plug it is recommended to use a new head button.
Do we know for a fact that heat ranges are the same across all brands of plugs/engines? In other words, is it possible that a P3 and a CT06 are actually the same heat range plug because there's no standard?