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my 1920. Metering block and all...
Just a question. Do they even have power valves?
Yep. See
here for a description of the 1920's "Economizer" (power) valve setup.
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How come everyone says they become junk?
Different carburetor designs fail in different ways. The 1920's metering block has a great many hidden/blind passages that can become clogged or corroded after a few decades and maybe eight or ten rebuilds.
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You can get a wire in most places
Don't clean passages with wires! You stand a high chance of wallowing-out the passageway, making it too large and throwing off the carburetor's calibration. And you will certainly scrape away the surface protective coating, exposing the base potmetal and greatly accelerating corrosion of the metal. Potmetal corrodes in very messy fashion, producing white powder that clogs whatever it collects in.
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I have a buddy that keeps telling me I should put 2 Carter BBS on my intake.
OK, so it sounds like you're running a twin 1bbl intake. My preference is for the Carter BBS rather than the Holley 1920, but as has been mentioned on here before, these days it often comes down to a choice of which can be had in better condition. A new or excellent-condition 1920 is better than a used-up or poor-condition BBS. But condition for condition, I do prefer the BBS.
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He says they won't stay in tune
A carburetor of fundamentally sound design, in fundamentally good condition, will hold its tune. If one or more of those conditions isn't met, then all bets are off. But yeah, he's wrong. A 1920 in good condition will hold its tune fine.
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