Hey all. I am curious about a random popping in the exhaust after the car has been out on a hot day. I have 57 t-bird with a 312 all stock. It has 4160 Holley. The vacuum is pulling about 19.5 inches. I am not sure what the timing is set at. The timing was set using the vacuum gauge. I run high test fuel 91 octane. The car generally has a very smooth idle and I do not get the popping on a cool to warm day. The engine temp was about 196˚ at the thermostat housing. I also notice on hot days my fuel bowl is about half full and there is a little bubbling action. I am not sure if that has anything to do with the popping.

Thanks all