Re: rochester carb for 1955 400

Posted by JWL On 2009/11/1 20:59:11

Question: Eric, On the 1955 Four Hundreds, is the vacuum connection made at a port directly into the intake manifold, or is it taken from a port in the carburetor? With the first connection, there would be full manifold vacuum all the time. With the second connection, there would be a variable vacuum amount depending on the throttle butterfly valve position. Different sources would affect how vacuum advance behaves. If I recall correctly from the past, some engines used intake manifold as a source and others used ported carburetor as a source. Does the Edelbrock offer both? Just curious. Thanks.