[John Brown]

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I was told by an old timer who was a tool and die maker. You can heat up a rusted part and then cool it very quickly with water? I did it with an exhaust pipe and I was able to twist the 2 pipes apart with my hands. So I would think it would work for your manifold also. I guess the theory is when you put the cold water to the hot surface it loosens up the rust? Not sure if you want to give it a try?

Jason

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I've done that many times, and with some pretty valuable manifolds too. Learned the same trick from an old blacksmith. First time I saw him do it I thought the manifold was gonna be toast, but it has worked fine every time I've done it too.