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Weber has used this on several of their carbs, most notably the 40 IDA-3 (3 BBL) used on the 6 cyl 911 Porsche. With all things being equal, it allows a variable air bleed to be opened to even out the amount of air being draw in into each cylinder. I wish the 2bbl 48 IDA had this feature.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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