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Old 12-22-2020, 07:33 AM   #17
ThreeQuarter
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Join Date: Jun 2000
Location: Texan in Iowa
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Re: Engine Timing Help

Quote:
Originally Posted by cadillac_al View Post
Most engines prefer full manifold vacuum. I use ported vacuum once in a while if an engine doesn't seem to like a lot of timing at idle. I'd say give that 327 some more timing at idle.
I don’t understand how this would play into my problem with initial timing, which doesn’t use the vac advance?
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'16 GMC Sierra 1500 SLE Dblcab 4wd 5.3
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