Simple heater wire wrapped around the Bing carb can provide enough heat to prevent carb ice. Please note: this installation may not provide enough heat to melt ice that has already formed. The wire used is glass insulated Nichrome, NiCrA-30DGL, 30 awg, available from www.wiretron.com. Approximately 18" of wire is required per carburetor, with a resistance of just less than 10 ohms, drawing about 20 watts or 1.5 amps and providing about 100F of heat to the carb body. The wires can be led to a switch, or directly to the bus so that carb heat would be available whenever the engine is running.