Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Port or Full time vacuum
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Old 09-11-2003, 02:19 PM
JUSTINH JUSTINH is offline
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On my 65 Buick 401. I tried full vacuum but got a rough idle. I went to ported idle and it smoothed it out.

So my advice is to just try the 2 possibilities. Since you don't use it for initial timing, all you do is move the vacuum hose.