Holley Mechanical Secondary “Double Pumper” Performance Four Barrel Carburetor Manual

The Holley mechanical secondary or “double pumper” four barrel carburetor is one of the most popular replacement carbs ever made. Standardized parts and unlimited tuning capability have made this carburetor legendary. Should you pick one up new or used here is the Installation, Tuning, and Adjustment Manual offered by Holley.

Holley Mechanical Secondary “Double Pumper” Performance Four Barrel Carburetor Manual
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1 Comment »

  1. robert said,
    October 14, 2014 @ 8:53 am

    Hi there, Im not sure what my holley 750 double pumper specs are as it has stamped List 4779 and then just below this marking it is stamped 0505 I looked at carby specs and could not find this one on the list? I wanted to know the standard jet sizing and squirt sizes please

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