[Oldporsche]

I personally think that split fires are not worth any difference in price. Yes, there are racing plugs made with multiple ground side electrodes. We used some in the old racing days that were true side gap electrodes from autolite.

Multiple spark ignition systems work well at low speeds to completely burn all of the combustible mixture in the cylinder. These systems work very well for rich idle mixtures. I know that the engine idles much cleaner especially for carbed motors.

Good luck,
David Duffield