Quote:
Originally Posted by 68 P.O.S.
You only use ported if your engine is running an EGR valve for emissions .... call me crazy, but I'll believe the GM engineer who helped develop the system.
|
I'll run them as his boss specified them to be run. If Zora wants ported, Zora gets it.
Obviously they had vacuum advanced for at least 10 years before EGR!
What I will grant is that in later years, particularly once they started to care about idle emissions and ESPECIALLY once you have EGR and cats then they're doing all kinds of goofy things like running ZERO initial advance and no vacuum to keep the chamber temps where they need to be.
But you tell me why vacuum advance is ported in 1967 then, if not for driveability.
I'm sure there were people who thought PCV was evil and road draft tubes were good enough too....