Quote:
Originally Posted by RichardJ
>>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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What makes you think that just because the vac ports on both the 235 and 283 are up near the top of the carb above the throttle plate that they have to be a ported vac source.
They are manifold vacuum!