Getting ported manifold vacuum with a 1954 Holley 4000


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By Bruce Compton - 12 Years Ago
Now that I have a later distributor with centrifugal and vacum advance capabilities, is there a way to modify the original Holley 4000 on my '54 Merc to get ported manifold vacuum to the distributor?? I'm hoping that someone has done this before by plugging certain passages and/or opening others to block the venturi vacuum and open the manifold vacuum passages.  Right now I'm using full manifold vacuum from the wiper port on the intake. I'd like to have the option of trying both sources. Thanks :  Bruce 
By The Master Cylinder - 12 Years Ago
I believe Ted posted on this a while back but I can't seem to locate it, someone will.
By Ted - 12 Years Ago

Bruce.  The next issue of Y-Block Magazine will have an article covering the modifications necessary to convert the Holley Teapot carbs so it has a true ported vacuum signal.  But if you’ll email me, I’ll send you a copy of the article in PDF format.  My contact information is at www.eatonbalancing.com .