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After three sets of Quad ring failures in the last three months , I just finished up a 6139s carb and for the first time I am so glad to report that this old Thermoquad has zero fuel leakage into the primary circuit through the main wells . Run 72 duster all day today , runs super well, and...

I have a 6139s 1972 Duster carb that swells up the X rings real quickly causing massive fuel leak into the primaries . Please , I am desperate after three carb kits to get the correct kit or seals that will not swell up and fail . Want to not replace this OE carb , when it is first rebuilt it...