Holley primary metering block - NCRS Discussion Boards

Holley primary metering block

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  • Michael M.
    Very Frequent User
    • January 31, 1993
    • 603
    #1

    Holley primary metering block

    Does anyone know what the Holley primary metering block #5271 was used for.
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    • Michael M.
      Very Frequent User
      • January 31, 1993
      • 603
      #2
      Re: Holley primary metering block

      #5271 is stamped on top of the primary metering block. I want to say this primary block #5271 was used for a 750 cfm or 780 cfm carburetor. Can the Holley experts chime in.
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        • Larry M.
          Expired
          • November 30, 1986
          • 541
          #3
          Re: Holley primary metering block

          Mike,

          If the information at this site is correct, it's 780 cfm: https://forums.holley.com/showthread...50-carb-please

          Larry
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