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Mystery Switch


Guest 47jag

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This an extra air valve - a popular 1920s accessory. The valve introduces extra air into the intake manifold to lean out the mixture and improve economy when running easy. As the effect reduced engine braking, the valve had a "brake" position which closed it. A great idea which probably resulted in thousands of burnt exhaust valves!

1924 six cyinder Dodge?? I think not. The sixes were introduced in 1928.

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