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Old 09-11-2003, 01:52 PM's Avatar is offline Moderator
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Originally posted by JUSTINH
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.
Does your vacuum pot advance or retard the distributor as vacuum increases?