How And Why Move Emulsion Jets?

MomsDuster said

So next question is: why the middle in a 3 hole configuration? Or why the stagger in a 4 hole configuration?
Is it rpm or velocity dependent?

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Emulsion in a Holley block works when fuel level in the bowl drops. Picture the fuel dropping and uncovering each emulsion hole one at a time and it helps to visualize when each hole is changing the curve. It has to do with WHEN the curve changes.