Definitely not correct. The UK was the last market to change from ported to
inlet manifold and that happened in 1976. North America changed in 1971.
>From late 76 North American cars had vacuum advance only enabled in 4th
gear, controlled by a switch on the gearbox and a solenoid on the firewall.
The switch was also used as the OD lockout hence OD was only available in
4th on these cars as well. But the source was still manifold. As it was
getting much more difficult to pass the emissions tests (every car was
individually tested) many cars had the points plate pinned in position if it
was the only way it could be made to pass. They had all the vacuum advance
components, they were just ineffective. And the source was still the
manifold.
PaulH.
----- Original Message -----
From: <MGBnutt@aol.com>
To: <doddk@mossmotors.com>; <smarc@abs.net>; <mgs@autox.team.net>
Sent: Saturday, April 17, 2004 5:03 PM
Subject: Re: which vacuum source...
> I have the same question. Now I recently found a chart on someone's
web-site that says the 77-80 45D distributor uses the ported connection off
the carburetor, not the manifold source.
>
> On my '78 this vacuum line runs to a switch on the pedal box and I beleive
is only supposed to be activated in 4th gear. Can anyone confirm this?
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