Primary Billet Metering Block Std Calibration w/ Spark 1850, 3310, 4776-4779 1973-ford-bronco-esi3334571 20 Ratio - 28 Spline

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Primary Billet Metering Block Std Calibration w/ Spark 1850, 3310, 4776-4779 1973-ford-bronco-esi3334571 20 Ratio - 28 SplineStandard calibration for out of box performance designed to fit most real world street & strip carburetors. Simply add your jets and power valve to complete the installation.