Take the exhaust valve out. Get a wire brush on the end of a drill. Use alot of PB and soak it good. Clean the threads with the drill running with the wire brush. If you can get a tap run the tap in and out with alot of PB again. You should get threads out of this because the port is pretty deep. You wont be able to use the elbow because I'm sure that will worn down. If you don't have a tap that size I make one out of the same pipe size and cut grooves in it with a wiz cutter. Try to make the grooves in the pipe on a sharp angle and deep. Use it like a regular tap. Lots of lube and run it in and out alot. You might have to use a street elbow instead of the correct elbow. It should work. Also make sure you use a locking ring on the elbow. Use furnace cement on the treads.
Good luck,
Mike
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