RE: OS Max Plugs, Really Good
My guess is that the material used to make the fillament in the No. 8 costs more, and that makes it more
costly to produce.
BTW both my AX .46s were shipped with A3s and they run well with them. I plan to do more in depth
testing of the No.7 plug next spring as I'm about to take down my engine stand for the winter. It looks
like the No.7 is going to be a winner.