Thread: Timing question
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Old 08-20-2018, 08:09 PM   #8
truckster
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Re: Timing question

Quote:
Originally Posted by AussieinNC View Post
Vacuum to the distributor should be ported vacuum...not direct to the manifold....there are two sources for vacuum on a carb...one that has no vacuum at idle, meant for the distributor...so it should show zero vacuum at idle...(650 rpm)
and one or more that are full continuous vacuum for various accessories.
Here's a really good article by a GM engineer that explains why you want to run manifold vacuum (not ported) for your vacuum advance:

http://www.camaros.org/pdf/timing101.pdf
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