^ Thank you, Bob, for clearing this up.
I'll add that while it isn't in the current Briggs rule set, I suspect that it could be added as I think this has become an even greater problem now than with the old Champion plug.
There are a couple of ways I have seen these plugs modified -- I'm not going to share that info openly...BUT, suffice to say, it needs addressed because I've seen some come illegal from the factory too.
Like Derek, I found out real quick when an LO206 engine with a rev limiter ran away from me on the dyno. LOL
Trust me, there is a real advantage to turning the engine higher rpm if you can.
Swap the plug and wa-la, back to 6040 or 6050 again.
One plug that I have in my possession, that I share with others as an example at our tech seminars, has one of the ground prongs stamped incorrectly from the factory and is considerably closer to the center electrode than the other three. Another was "massaged" and is pretty obviously altered.
Dan is aware of the problem, same with the heads...I'll wait to see what Bob posts about that before I comment any further.
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
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