A properly tuned engine and cleaned connections is all you need. Would you run your house lights on 240? I'm sure somebody will speak up and say it's fine but it was designed for 6 volts not 8 volts or even 12 volts.
1953 Chevrolet 3600 Fried Green T'mater (Vern) In the Stovebolt Gallery Caution: Political Statement Man who runs in front of car gets tired, man who runs behind car gets exhausted.