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I do not have the choke heat tube connected to the manifold. I just noticed there is a slight air draw on the open fitting at the carb.
Does this have any effect on performance of the carb ( vacuum leak ), and should be plugged, or does it matter?
Can't tell if it is a vacuum draw or just a fresh ( warm ) air pull into the choke only.
Thanks
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If you are talking about the tube into the top airhorn of the carb, you should plug it because it is allowing unfiltered air into your carb.
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Steve, thats perfectly normal. Thats how air reaches the bi-metalic spring that opens your choke.
Howard
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Like hmartin said, the vacuum allows air to get to the bimetallic spring in the choke. It is a very tiny vacuum leak, but apparently causes no grief.
I think hornman was thinking of the 1/4" tube that some carbs have that points downward from the flat part of the carb airhorn. That one should be plugged. Not all carbs have that one. Mostly OEM Holleys and emission type carbs.
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The 1/4" port on the right side of the air horn was used as a "filtered air" supply and piped down to the sheet metal choke stove on the manifold, then the choke heat tube routed the warmed air to the choke. This supply tube wasn't used on many models, but was used on some. The big parts stores still sell the tubing kits. These kits work well with headers.
What makes the filtered air supply funny is that the choke actuation rod penetrates the air horn without a seal, allowing in unfiltered air.
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