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« on: July 26, 2013, 02:31:29 AM »
I switched my vacuum advance from ported to manifold vacuum on my 396/375hp and boy what a difference.My car always ran fine but now it runs even better.I also noticed a drop in engine temperature at idle.Any time my car idled for long periods or I got stuck in traffic I would see the temp gauge slowly go up.I had it running for a 1/2 hour and the hottest it got was 197 degrees.The only problem I have is I cannot find the correct vacuum advance.I am running 12" hg at idle and my advance starts to move at 8"hg and stops at 15"hg.So my idle is a little unstable.All the part numbers listed in the forum for the vacuum advance I need are discontinued.Car Quest told me the part number is good but they are not sure they can get it.Paragon Corvette has an aftermarket vacuum advance with the correct GM part number that I need but they said they do not know if it is the right 4"hg start to 8"hg end that it is supposed to be. I don't want to spend 45.00 and it is the wrong one.Has JohnZ ever dealt with Paragon Corvette?They have 6 different advances listed with different part numbers.I just want to know if all the advance units are the same vacuum pull but have different numbers stamped.IN NCRS judging I guess they check numbers like that.Someone who has a NCRS corvette is probably more interested in the correct numbers than drivability.