ORIGINAL: opjose
A long plug tends to help with inverted engine positions.
The Evolution designers utilize long plugs, so I would assume that they know what they are doing.
I don't know about the long plug helping with the inverted engine because I don't invert my engines often.
All their 2 Stroke Glow Engines are long pluged from the factory incase you didn't know... so maybe too Evolution, it doesn't make much or any to list it? I called Horizon and they said it doesn't make any difference or it would have been noted in the manual.