What? I have a hole in my carb? How'd that get there?

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Cruisingram

Cruisingram

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Had the engine out, repairing the oil pan and working hard to button it up good. Cleaning up everything, and I see this hiding at the base of the carb. WTF, how'd that get there? I am replacing the motor within 6 months and it will be a 2 bbl, so JB weld it is.

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IMG_20211215_182056278_BURST000_COVER.jpg
 
I believe it has to do with the transition from the idle circuit to the main metering circuit. I looked in my 63-service manual and they did not show it or explain it.
 
It is used to pull fresh air in, in hot start conditions, where fuel vapors are heavy.
 
It has something to due with getting more air during hot start up conditions
 
I posted about this a few years ago. A Holley 1920 for my 1969 Slant Six 225. It was the 4th rebuild carburetor I tried over 20 years and made the engine purr like a kitten instead of stumble around idle. I thought that hole was unique to the 4th carb, but can't say the others didn't have it. No repliers then had seen such or knew the reason. I thought it might be a trick the rebuilders did, but sounds like a factory thing. Not sure why they want to suck in unfiltered air. Post 14 link discusses the Carter BBS, but likely same explanation for Holley.
 
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