RE: Difference between A3 and #8 plugs??
I like the A3, i run 10% omega in all my glow engines and use this plug in all of them ( TT GP.07, TT PRO.36, TT PRO.46, Magnum .15XL and .15XLS and my OS .40LA ), i've had no problems with this plug at all. I only have a #8 in my OS .25FX cause it came with it.