It's not so much that the *distributor* needs manifold or ported, but the
application. A distributor will work with either, but give different
emissions results at idle. Correct set-up for running can be achieved with
either, but a ported setup may fail emissions. It is possible to run
without vacuum, but you will get poor cruising economy or pinking under
----- Original Message -----
From: "Dodd, Kelvin" <firstname.lastname@example.org>
To: "'Zach Dorsch'" <email@example.com>; "MG LIST" <firstname.lastname@example.org>
Sent: Thursday, September 26, 2002 4:19 PM
Subject: RE: Vacuum Advance Part
> Paul shows that distributor as needing a ported vacuum source, not the
> manifold only vacuum source available on your manifold/carb combination.
> So, you are going to have difficulties getting the engine into correct
> even with a brand new vacuum unit.
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