1937-1951 Buick Exhaust Manifold Valve Body. 320 Engines. Series 60,70,80,90

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1937-1951 Buick Exhaust Manifold Valve BodyFits All 320 Engines - Century, Roadmaster, LimitedCast Iron / Machined as OriginalDoes not have "butterfly"Originally, Buick incorporated a “butterfly” or “flapper” in its valve bodies. Its purpose was to quickly heat the fuel mixture in the motor, particularly in cold weather. The butterfly valve is normally closed when the engine is cold. In its closed position, exhaust gas would be directed into the intake manifold, heating the fuel mixture ...

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