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Showing results for tags 'manifold vacuum'.
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51 cranbrook, 218, bone stock at idle, with vacuum guage connected at the nipple seen on the side of this carb, I get zero vacuum at idle. when rpm's are increased it goes all the way up to 21 vacuum. If you look at the carb nipple, you can see by the shape of the body that it leads up and into the throat of the carb. The other raised channel is the port on the bottom of the carb that leads up to the carb bowl vent. from reading the other thread, I think I am supposed to have 21 vacuum at idle? I dont see how its possible with the nipple running to carb throat instead of getting vacuum source at the manifold somewhere (there isnt a spot as you know) By watching the vacuum guage, I see the distributor advance is getting vacuum when it needs it at rpm's, so I am majorly confused.
