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What makes a carburetor design for automatics vs manual??

Speaking Holley only.

I have seen some carburetors called-“automatic” ie automatic carburetor in for sale areas. Wondering what that means?

I understand that a mechanical secondary is better for a manual transmission and a vacuum secondary is better for an automatic generally and that tuning would be different but is there anything else inherent in the design that’s different?
Mostly jets, adjustments, and dash pot or not. With today's pump gas, the question is mostly moot. It's trial and error to get them tuned exactly, so, I wouldn't worry too much about whether it's a manual or auto carb, unless it for 100% show where numbers need to match.
 
Mostly jets, adjustments, and dash pot or not. With today's pump gas, the question is mostly moot. It's trial and error to get them tuned exactly, so, I wouldn't worry too much about whether it's a manual or auto carb, unless it for 100% show where numbers need to match.
Thanks I was just wondering what the difference really was.
 
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