[427TJ]

It does it both when cold or when warmed up. I tried some of that Seafoam engine treatment and that seemed to help. The idle improved right away and the knock became less frequent. I ran 1/3 pint through the carb, as per the instructions, and poured the rest into the tank. Runs better but still a knock every now and then but not as often. Again, I'm just nursing it through this summer before pulling the trigger on a rebuild so it's band aids until the the rebuild can commence.

Thanks again for all the comments!!!