I think of the Nova Rossi and older Rossi engine as a real high performance piece of equipment that in no way designed to be a sport engine but a Speed and racing engine adaptable to other competition events.<div>The use of Rossi plugs and the recommended fuel would be something I'd use exclusively until told other top flyers like Dave Phillips or other guys flying hundreds of flights that some other equipment was OK.</div><div>I have cards of older Rossi plugs for my older Rossi engines and they are of a much more robust material density and construction. I only ever use those plugs for my engines and intend to on my new Nova Rossi engines too.</div><div>Chris...</div>