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I have noticed in Alfetta book that there are variations of the same type of carburettors with small differences in characteristics. For example DHLA 40H for 2.0L engine appeared with Alfa Romeo part Nos. 116.78.04.010.01 & 116.78.04.011.01 (matching pair) with main 150, idle 58 and main emulsion tube 7772.10.28, for the same engine there is an alternative pair with part Nos. 116.97.04.010.00 & 116.97.04.011.00 with main 148, idle 57 and main emulsion tube 7772.11 and finally a last one with part Nos. 116.55.04.010.04 & 116.55.04.011.04 with main 150, idle 58 and main emulsion tube 7772.10.28.
I am wondering these slight variations what actually means? It could be different emission regs applicable to different markets but how they affect performance? If someone had to choose which one could be better and why? All above are DHLA 40H which I consider very sophisticated and far different than DHLA 40.
 
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