They all have different numbers. Even though they are all 4100's, they are truly unique to the vehicle application which is based upon vehicle weight and size, engine cubic inch and volumetric efficiency, intended RPM range, emission type and transmission type.
Now again some of these ae blurred, (like a 60 thunderbird carb for a 352 is completely different than say a 65 galaxie carb 352/390) and when swapping probably wouldn't notice much of a difference (only on a dyno).
But others carbs having similiar identities can cause much confusion. (like a 66 california emission thunderbird carb #6 S C and a 66 mustang 6 Z B, Both are 1.08 1966 carburetors but one is intended for a heavy FE (428) powered car and california emissions and the other a very light 289 powered car).
Again there are over 120 differing varieties of 4100's spanning 10 (actually 13) years and at least that many or more of the 2100's which spanned over 20+ years if you count the 2150 model. At least the 4100's only have 3 types of venturi sizes whereas the 2100 has 8.
Bill White
White Automotive
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