Holley 4160 (3310) manual internal or external vacuum souce

[cudajames]

New to holley carbs and I am having difficulty determining if my 4160 (3310) has internal or external vacuum source

I plan to do the manual to electric choke conversion

I know I will probably feel silly afterwards - after removing the choke there should be a boss that can either be plugged or open. I am not sure where that boss is located?

Pictures would help

thanks

 

[Arron tate]

New to holley carbs and I am having difficulty determining if my 4160 (3310) has internal or external vacuum source I plan to do the manual to electric choke conversion I know I will probably feel silly afterwards - after removing the choke there should be a boss that can either be plugged or open. I am not sure where that boss is located? Pictures would help thanks

Hello cudajames.
You may find your answers here for the vacuum.
https://documents.holley.com/199r8108-2rev4.pdf
And here for the choke.
https://documents.holley.com/199r8000-4.pdf
There are also nice videos on the Holley website and on You tube on the subjects.
Hope this may help.
Happy Mopar
Arron.