So I've got a 79 trans am with a 400, I know I know, not a Camaro, but I figured y'all could help. I have coolant magically vanishing, but not completely. I can fill the radiator up to the top, turn on the car, and watch the coolant level drop 4 inches in seconds with a steady stream of bubbles until it reaches a certain level, and then stops. I can drive the car all day like that and no more coolant vanishes. Doesnt over heat, runs great, no smoke, no smell, oil and coolant are regular coolers, no leaks that I can find. My overflow bottle is dry as well. Any idea what is causing this? I hope it's not a head gasket on worse, but it doesn't show any of the other symptoms. You'd figure with half a gallon of liquid disappearing in 10 or so seconds, there would be some smoke or something. Thoughts?