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Old 09-22-2016, 01:11 PM   #31
RichardJ
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Join Date: Apr 2010
Location: So Cal
Posts: 1,402
Re: HEI ignition secrets

>>All carbureted cars were set up with direct vacuum to the distributor before more stringent emissions requirements reared their heads.<<

Again the bologna about vacuum source before emission systems.

In the '70s, manifold and ported vacuum were often both used on the same engine and routed through various temperature and electrical controlled devises to determine the best timing to make the engine run like crap.

Mixture and burn time at idle sounds more like an emissions issue.
I guess 50s and 60s engines were never allowed to idle for very long if the had ported vacuum.
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'67 GMC 2500, 292, 4spd, AC
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