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the way i have seen it done with vac secondaries is to wire the secondaries shut with both carbs and makes runs and adjust it to where it runs good with the primary jets. then you can add the secondaries into the equation and use the different springs to adjust when the secondaries open. you're supposed to go lighter and lighter spring pressure until you lose power then go to the previous spring. that's probably the best way to do it if you don't know anyone that is familiar with them. hope that helps
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