My 1941 9N (no trailer queen) that I have had for over 20 years. Prior to my ownership someone broke the rear exhaust manifold stud well inside the block. In replacing the exhaust gasket I find that the stud hole has eroded into the water jacket and the intake for #3 & 4 cylinders. It appears that the erosion goes from about 9 o'clock up and around to near 3 o'clock inside the hole. Looking for advise if this is fixable and suggested cures.
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