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  1. G

    Holley 750

    Running a 4779 Holley 750 Dbl Pumper on my 440. Seems to run rich, plus has a stumble right off idle. Probably in the transition circuit. Plus I can hear a whistling sound at times when I'm at part throttle. So I'm suspecting a vacuum leak. Runs fine at all other openings. It has a Performer...
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