I had a similar problem on my SMTA when I bought it, actually the next step of it, muffler rotted away and engine was stuck. Old pipe just wouldn't thread in well. I got a new pipe nipple but threads worn in manifold badly. I couldn't find a pipe tap that size so I got another short pipe nipple and made 4 cuts perpendicular to the threads with a hack saw. I threaded it into the manifold, turning it foreward and back to clean threads. I put a rag with some grease on it below the pipe in case some metal fell in there. You have to be some what careful as the tapered threaded pipe can exert great pressure on the manifold and you don't want to crack it. Anyway the second pipe nipple with cuts seemed to clean threads some. I used a long pipe wrench with cheater handle, but went foreward a bit then back a little. Finally got to where I could thread my pipe nipple for the muffler in sufficiently to hold. My manifold is really worn in the threads and the muffler on top puts a lot of leverage on it so it is tough to keep tight. I didn't use any sealant on it but suspect never sieze would be the way to go. Good luck but take it easy putting it together and use some patience so you don't crack the manifold. When I put the final nipple in the manifold again I used a long pipe wrench with cheater handle but I worked the nipple back and forth instead of just applying a lot of quick pressure to it.
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