If it is broken off flush you need to remove the manifold. Since it is a 3/8 stud you take a 5/16 bolt, bevel the end of the bolt and mig weld it to the remaining stud. Now you have something to turn with a wrench. Next step is a lot easier with a helper but is possible to do by yourself. Mount the manifold in a vice. Using an oxy acetalene torch heat the manifold up glowing orange around the bolt. While it is still glowing turn the bolt out. It is easier with two people so one can keep the torch on it. If you let it cool till it is no longer glowing it is much less likely to work. Someone will probably say this is not the best way for some reason. But after a machinist told me to do it this way I tried it and it worked like a charm every single time. Every other way I have tried was hit or miss at best. Yes it is more work and requires more tools, but if you have the equipment it always works. Or at least it has the 50 or so times I have done it.
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