I got the flatty six running in the '47 Dodge sedan a while back, and it got to the point that a couple valves would stick. It would run really rough with some clatter for a few minutes when holding the RPM up, then just clear up and run smooth as silk - Until it sat long enough to cool off. Then it would do it again. I tried several methods of de-carboning the valves with no luck. So I got the idea of pouring oil into the carb until it killed the engine, then let it sit for about a week. worked great for quite a while just starting the engine and running it in the shop without driving. Now it's doing it again. This time I'm getting an intake valve hanging up, and blowing fuel out of the carb. I just did the oil thing again with a little fuel system cleaner mixed in. What have you guys experienced in this area?