Re: Problem at the track
You can add weight to the top half of the air valve, equally of both plates. Use a screw and a locknut and lead weight. Trial & error.
If the port above the throttle plates has vacuum, then throttle plates are open too far and may be needed for the camshaft installed, unless you open the secondaries slightly so you can close the primaries further. only you know what your engine requires.
I find an HEI equipped engine runs better with full vacuum going to the HEI vac cannister, therefore, you should be able to close the primaries further for better engine response all around.
I have a 307 set up the same way, idles at 600 rpm, snap to WOT and it's turning 5K, air valve is just starting to open. With no load, air valve will never open - too high of rpm, but, it does start to open. Air valve opening is engine demanded - the airflow requested by the engine will open it.
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