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    1. · Premium Member
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      7,380 Posts
      ….my 850 Street HP on the 6.0 has 40 / 40 squirters, 82/86 jets and a 10.5 p.v.
      same carb on my 388 only needed 35/37 squirters 80/80 jets and same 10.5 p.v.

      mine had the tiny black vent whistles, took me forever to figure out that was why mine would launch, then bog. Fuel was going over those vent whistles and dumping in the carb. Put in the reg longer vent whistles and all was good.

      its a weird carb calibration.
      Did you go with the regular white Holley or the black quickfuel Vent whistle?
      I have a 950 street hp going on a 454 and had to check it after this thread and had those small baffles you describe(but white).



      If the top Do you have to drill for the screws?
       
    2. · Premium Member
      1971 Chevelle. Carb’d 6.0 LS Th350 3.90 12 Bolt. 1972 Greenbrier Wagon 489, 700r4 3,73 12 bolt
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      3,671 Posts
      Did you go with the regular white Holley or the black quickfuel Vent whistle?
      I have a 950 street hp going on a 454 and had to check it after this thread and had those small baffles you describe(but white).



      If the top Do you have to drill for the screws?
      I used one out of a QFT metering block. It was the black one. The stock one was maybe a1/4” at best.
       
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