Mine leaked for years. I thought it was the mating surfaces, but it iurns out I had a small crack between the oil sending unit boss and the mounting surface from overtightening the oil sending unit. As a result the sending unit threads leaked. New adapter solved the problem.
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Ken
'68 GTO - 464 - Ram Air II heads - 236/242 roller - 9.5” TSP converter - Moser 3.55 Truetrac ( build thread | walk around)
'74 Ventura 350
'69 AMC Javelin SST
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