Welding cast iron requires that the piece be pre-heated. Then you will need to use either iron powder (if gas welding), you can braze it (brass), or you will need to use nickel rod (or wire if MIG).
When you are done, the piece will have to be slow cooled in sand. Then after cool, the weld area will have to be peened to relieve stress.
I have simplified this pretty much to illustrate if you are not setup to execute these steps, you are much better going to a weld shop that is.
If it is a standard manifold, I think you will find it reasonable to buy a new/used one. IF it is a dual-fuel one, then it might be worth repairing.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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