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It is the model of the carb. Among other things, different needles are used,
and different springs, and some models mount differently or have different
float bowl angles, etc etc. But most of them used on Volvos are pretty
interchangeable.
AUD252 carbs were used on 67-68 144s with the B18B engine. They have DX needles
and red springs.
The AUD94s were used on the 63-65 P1800s with the B18B and came with ZH needles
and red springs. Should work fine - may need different air cleaners.
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George Downs Bartlesville, Heart of the USA!
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