Remove it and braze it. I have successfully brazed a couple cast exhaust manifolds, and both held well. But the trick is grinding in a v notch, and getting it hot prior to brazing, and use good flux coated rod. I have a diesel tractor I brazed a few years ago and it was broke clean at the base of the pipe. I ground it off clean, and brazed the pipe to the manifold, and it has been hit by more than one limb and still holding great. If you can find a good used manifold reasonably priced, that would probalby be a better option, but I always enjoy a challenge, especially when it saves a few bucks and nothing to lose by trying. In your case, you will likely know before you reinstall if it works. Trick is to preheat and get it clean and get good flow into the crack. Does not appear to be any stress, so if you can flow it in well, it should work.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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