Re: Intake Manifold Vac lines

Posted by HH56 On 2017/10/14 19:59:03

That "nub" is the bottom end of the choke stove. As you said, exhaust heats the air drawn thru the tube by vacuum in the carb pulling air over the choke bimetal spring. The part in the manifold is pressed in and should be air tight so no exhaust exits around the tube at either end or thru any rusted out spots in the tube. The portion continuing on to the carb and choke just slides in the upper end about an inch -- maybe less. That part is snug but not really an airtight connection. It should be able to slide out but since they were steel tubes if it won't came apart it could be rusted solid. The crimp on the bottom is not connected to anything and is probably there to kind of restrict the amount of air flow so it has a chance to get heated.

I don't know of anything that will keep the ivory paint from showing the heat and it seems to be evident on just about all the ivory colored engines. I don't think any high temp engine color paint is available but wonder if there is a higher heat stove or radiator paint available at the hardware store that would be a close enough match to the ivory.