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Reply to "Mechanical vs Vacuum Secondaries"

As a point of reference, I installed a QuickFuel SS but went with a 600 CFM with mechanical secondaries.  I mounted it on a 1" spacer to clear the fuel line fittings.  I tuned it (4 corner adjust) and followed all the "advice".  It still had a flat spot from idle.  So I bought an accelerator cam kit and changed the pump cams to increase the squirt amount.  That resolve the flat spot.  The car will start from stone cold after weeks of sitting with two pumps of the pedal and immediately idles smooth.  Once warm and the choke off, the car pulls very smoothly to redline.  I have not changed jets nor does it suggest they need to be changed.  I spent a lot of time with my vacuum gauge setting the mixture screws.  A small amount of richness helped with the flat spot as well as the car runs off the idle circuit up to a certain RPM.  But I was able to get a very steady 17" of Hg with the screws with a little patience.  Overall, I am very happy.  Probably the biggest pain in the ass was getting the bowl inlet fittings I bought to seal.  Do NOT try to use the Holley paper thin gaskets with teflon on them - they are a joke.  I bought a fitted line kit pre-built that used the 1/8" think nylon gaskets and followed all the torque specs and it sealed perfectly.  I also added a 3" thick K&N air filter that fits within the diameter inside the rear deck lid (as it is above the deck) - I think it is an 11" unit.  

Hopefully this helps you.

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