glenn,
After looking at your latest picture and reading the whole thread over, really need to know what carburetor you have installed??? It is clearly not an original for the 292 nor does it match original equipment that came with your '53.
Please find and report all identification info from your existing carburetor (brand, model, tag or ID number if present) to help us know what you have to better offer suggestions.
In reviewing your picture, I see 2 possible problems that relate to vacuum and or vacuum leaks which will affect your engine operation significantly.
I grabbed your picture and added some arrows (attached below) to point out 2 possible vacuum related issues that seem to need attention.
The larger arrow pointing left seems to be your mentioned unused port that has vacuum when the engine is running. As that appears to be part of the electric choke mechanism on the carburetor, an initial guess would be that it has to do with a vacuum operation of the choke mechanism (someone with more experience will hopefully chime in to make this clearer).
The smaller vertical arrow is there to point out what appears to be an intake manifold vacuum port (looks uncapped/unconnected to anything). Can only surmise that at one point it may have been used to provide vacuum to the former original vacuum wiper system or was maybe part of the original 292 carburetor choke controls (only guesses).
With both of these apparent vacuum leak sources, your engine will run erratically with poor performance at best.
It could be possible to use the 2nd identified port in the intake manifold as your vacuum gauge connection, which would solve at least one of your vacuum leaks.
Can't really provide more help on the 1st open "threaded" port until we know for sure what carburetor you have as its designed function needs to be known.
One other note related to this picture - your electric operated choke mechanism appears to be disconnected (nothing connected to visible electric terminal) so no idea how your choke is supposed to work with out that being connected.
Hopefully this is useful info for you to chew on and you will report back so we can try and help you further.
Dan
Thank you Dan, I posted more pictures on page 4. There are no names on the carb. Hopefully the weather will allow me to work on it tomorrow. Thank you!
