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Old 01-18-2021, 03:21 PM   #14
Hal Beatty
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Join Date: Jul 2012
Location: Bellingham, WA
Posts: 213
Default Re: Manifold vacuum at idle... vs without...interesting observations

Quote:
Originally Posted by Kilohertz View Post
Thanks for the input guys, appreciate it.

As mentioned I machined a GM distributor to fit the flathead so manifold vacuum is where I have connected it. This is the classic location before emissions based ported vacuum came about.
And that myth just keeps perpetuating... every engine from the late '50's that I ever worked on used ported vacuum; long before emission controls entered the picture.

You say you are using the stock 94 carburetor. If it was the one used with the Load-a-Matic distributor it has different passages for the dist. vacuum and will give you a venturi vacuum signal.
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