I think with the big fat spark of modern electronic ignition systems, spark plug gaps are far less critical than they used to be. Obviously for Raphy and me running our S&S engines in a hot climate, where cylinder head temperatures get quite high, especially if using the original baffled exhaust system (my cylinder head temperatures dropped over 40ºC by changing to G56 non-baffled exhausts), resistance to thermal erosion is an important consideration on the plugs and that is why I use Iridium plugs. I would think Bosch platinum plugs, like Porsche recommend for their turbo engines, would be equally good.
Wilson
