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I think they were used on some 72 Bs. Not sure why but the needles are ABDs and in the 493 carb they were AUDs. The only differance I can find is the ABDs are aprox. 1/8th inch shorter but the taper seems to be the same. Would this be for more high speed fuel flow? Would the ABD be a rich mixture needle? /ubbthreads/images/graemlins/crazyeyes.gif PJ