In Reply to: Re: Choke plate posted by Frank (WNY) on July 27, 2018 at 14:11:54:
Frank, Some of the earlier manifolds had a plug on the intake side.
Often used to operate a milking machine.
Actually a vacuum gauge is a better diagnostic tool than a tachometer to show what is
going on inside of a engine. check the how-to's.
I have added a vacuum port when I have had the manifold off.
By drilling a hole in the intake side and threading for a 1/8 inch pipe plug.
Then you can connect a hose barb to the manifold.
I have seen 1/8 inch valves with a hose barb included installed.
I would be awfully leery of drilling the manifold with it on the engine.
I wouldn't want drilling burs inside the manifold.