Editing How to rebuild a Rochester Quadrajet 4MV carburetor (section)
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===Secondary=== There's no point in doing anything (other than for personal satisfaction) to the secondary side casting unless there's some huge gaping mismatch, etc.The fit of the base plate gasket can be more of a flow problem than any casting irregularity; if the gasket intrudes into the throttle bore, removing THAT will help more than anything. Also, everywhere the casting is ground on or polished removes the protective finish from the zinc of the carb body, and that can lead to the dreaded attack of the "white stuff" that's mentioned anytime old carbs are talked about.
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