[Steeveedee]

The heat riser valve would be attached to an exhaust manifold, and the exhaust pipe attaches to it. It has a counterweight on it, which you should be able to move if the valve flap isn't stuck. You can try moving it. I'd recommend doing it cold. The pipe to the air cleaner is for Carburetor Heated Air. There is a valve in the snorkel that is closed cold and opens when the engine warms up. If it failed (or is disconnected) it can cause your carburetor to be hotter than normal under regular driving conditions.