mrfeez Posted July 25, 2023 Report Posted July 25, 2023 Their is a 1 inch in diameter threaded opening 3 inch's in back of my oil pan drain plug, can anyone tell me what it is for ? 1963 Avanti 289
Gunslinger Posted July 26, 2023 Report Posted July 26, 2023 Maybe the factory oil drain plug was cross threaded and a second drain hole was drilled.
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