mrfeez Posted July 25, 2023 Report Share 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 Link to comment Share on other sites More sharing options...
Gunslinger Posted July 26, 2023 Report Share Posted July 26, 2023 Maybe the factory oil drain plug was cross threaded and a second drain hole was drilled. Link to comment Share on other sites More sharing options...
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