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1946 Desoto 237 Engine


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That plug is what deleted the "Second Chance" full flow filter valve.

When Chrysler added a full flow filter to the 25 inch engine they feared it would plug up and cease sending oil to the bearings.

The industry solution was to make the full flow filters less efficient and add a valve inside the filter so they would always pass some oil.

The original system had a floating rod which would by pass the filter. This plug took its place and stopped the by pass flow.

Lucky for you, your engine does not have a full flow filter. it has the by pass filter. I say lucky because the plug screws into the block inside the pan at the pan rail. So you don't have to take the pan off.

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