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If you have a heavy car, or not very much gear, than the vacuum secondaries will make the car faster. There is a rubber diaphram that actuates them, that can tear, but I haven't seen it happen. If you remove the choke from your vac secondary Holley, there is a hole you need to plug. Don't remove the checkball from the vac secondary circuit either. The biggest problem is when guys try to change the spring that controls when the secondaries open, then reasssemble the vacuum pot incorrectly, then they have no secondaries.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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