Model T exhaust nut threads

I took the easy way out. I had an old exhaust manifold kicking around that was badly cracked but had excellent threads. I took a very sharp file and used the corner to cut V grooves acress the threads, basically making the old manifold into a giant tap. Whenever I had to freshen up an exhaust pack nut I would clamp the old mainifold into the vise and using my big wrench would work the nut back and forth on the old manifold's threads. It worked great.
 
You may not actually need to do anything with the threads. If you are tightening the nut like I used to do, the problem may not be the nut on the manifold. In my case it was the nut behind the wrench... me!

I would try to tighten the nut really snug but it always slipped the threads. I had been putting the nut on as far as it would go but the pipe was still loose. Then I saw in the catalog that they called it a "packing nut." So I wound a loop of fiberglas wood stove door gasket rope around the exhaust pipe and stuffed it into the packing nut before tightening it up. I was able to get the nut tight without it slipping on the threads and the pipe was pulled in tightly with no leaks. The rope took up the slack and provided a good seal.
 
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