Quick question for you guys, I welded the bung in the exhaust this weekend. I think I over heated it and shrunk it a bit. Could you guys tell me the thread pitch so I can chase it with a tap. Thanks Rich

Rich,
Most of them are the same as the large 18mm spark plugs. I am not sure of the pitch but if you get one of the two sided spark plug thread chasing tools, it will work.

Thanks Bill