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Is there a way to test the power valve and economizer? My 55 Thunderbird 292 automatic has a slight hesitation when flooring it at a dead stop.
The accelerator pump looks to be squirting from both sides OK. I tried the two adjustments on the accelerator pump, there was no difference
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You might try an additional 4° of initial ignition timing. Also check that the vacuum advance is indeed working. You can do that with a timing light and lightly speeding up the engine while watching the movement of the timing mark on the damper. See if this link to a recent thread helps in regard to checking out the economizer circuit. Holley 4000 teapot carb (y-blocksforever.com)
  Lorena, Texas (South of Waco)
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Ted (10/8/2024)
You might try an additional 4° of initial ignition timing. Also check that the vacuum advance is indeed working. You can do that with a timing light and lightly speeding up the engine while watching the movement of the timing mark on the damper. See if this link to a recent thread helps in regard to checking out the economizer circuit. Holley 4000 teapot carb (y-blocksforever.com) I have tried 8-12 degrees initial BTDC, no change. I had the vacuum advance can rebuilt recently and it is working. I have a few questions I will ask on the other thread
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