Thanks for all the advise guys. I have found a few manifolds out on ebay, most of them have both manifolds and are asking for the most part over $100. Don't need that. One offering just the exhaust manifold was priced high also. My manifold is in great condition, no rust and the heat riser is in good working condition. Think I'll go with removing the manifold, remove the remaining part of the stud and try re-tapping the manifold. Makes for good training and I enjoy working on these stovebolts for sure. Thanks again. Jim