Holley 34-6SA Secondary Metering Block Conversion Kit - Shiny Aluminum
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Easily convert your 0-1850SA or 0-80457SA 600 CFM carburetor to a model 4150 by adding a secondary metering block. The addition of a secondary metering block will allow you to fine tune your carburetor by utilizing replaceable main jets versus the fixed orifices found in a metering plate.