When swapping Qjets from larger cubic inch engines to much smaller engines (And vice-versa) say a 400 to a 250. You are likely to run into difficulties getting the idle circuit to operate properly. Most will run out of adjustment range with the idle mixture screws.
Part of the factory calibrations is the size of some of the holes drilled in the idle circuit. In addition there are some differences in how the venturi's are assembled. The closer you can stay to the carburetor's designed cubic inch application the easier it will be to get nice idle characteristics.
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If it breaks. I didn't want it in the first place.
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69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN.
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