I have a 56 Victoria with a 292 and dual exhaust. I have been putting up with a rattling noise from underneath and noticed that my exhaust pipe on the right side hangs down a little lower than the one on the other side because of the heat riser valve being on the right side. Because of this, the exhaust pipe is below center in the hole in the frame that it passes through causing it to rub and rattle. I think eliminating the valve would give me good clearance. I live in Tulsa and wonder if the winters are severe enough for me to really need the valve. Do cars really run much better with them. I'm sure they cause a condensation problem on one side and these Fords were notoriously bad on exhaust systems. I am leaning on deleting the valve . Also, should I decide to keep the valve, does anyone know for sure which side it should be on. The only illustration I could find showed single exhaust with the crossover pipe.   George