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oil return tube leak

Engine

Vehicle Information: Year: 1979; Engine (Size, Modifications): 3.3; Total Mileage: 87000;

After sitting fro a few days, an oil puddle appeared under the engine. It appears the rearmost passenger side oil return tube decided to burp some oil. Cleaned it up and it continued to leak oil for several days. What would cause this to suddenly begin burping oil after sitting for a few days with no oil leakeing. Can the return tube be removed without removing the head to r&r the seals?

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