Sorry - tried to find and reply to previous discussions - no luck. Previous discussions have indicated that if it is seized to just leave the heat riser open all the time. Chipper has said that it is closed when the arm is down and this is how it should be most of the time. Mine is not seized but the arm has been removed. Just want to make sure I install the arm correctly. Flap horizontal is closed correct? Previous discussion way back 04/14/14 (blue38) -found it on Google - everyone seemed to agree it should usually be open. Chipper says it should be closed. Hence my confusion. Can anyone clarify this for me please?
Hopefully this will eliminate the confusion. The "heat" control on the dash of 1932 Chevys is to be able to warm the carburetor on cold starts. Pulling the knob out, pulls on the cable and rotates the arm on the manifold counter-clockwise (lifts the arm up). Pushing in the knob rotates the arm down.
I think of the position of the plate to be open when there is exhaust gas passing directly under the carburetor. Closed is therefore when the plate routs most of the exhaust gas away from the bottom of the carburetor. If too much heat is applied to the carburetor in warm weather it will boil the gas in the float bowl and cause problems. In very cold weather warming the fuel might help?
Thanks Chipper. Good explanation. I removed my intake manifold to get a first hand look. The plate is not balanced and is heavier at the front, so pivoting on its own it sits in what you call the open (vertical) position with exhaust gases passing directly under the carburetor. So I need to move it to the closed (horizontal) position and hold it there while installing the arm facing down so that pulling on the knob moves it counter clockwise. I am missing the clamp for the cable. Anybody have pictures showing how it is installed? Thanks again.