How to remove a rusted/frozen radiator hose barb

Vintage manifolds are cool, except for the ubiquitous corroded radiator hose nipple that won't budge. Galvanic corrosion has stuck it bad, and...
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    Start by sawing it lengthwise as far down as you can go.
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    Bust off half with a chisel.

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    This one's almost off. The other side is next.
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    Take the blade out of the saw frame, and cut parallel trenches in the fitting. Pay close attention so you don't cut into the manifold threads - you want this to seal again!
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    Make a few cuts around the inside of the fitting. Then start banging around the outside of the fitting with the chisel. When you find a weak spot, collapse it inward. Work your way around it, peeling it off the inside of the hole, and eventually it will fall out.

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    Look at those nice intact threads! Clean with a wire brush, ,and chase it with an NPT tap if you have one.

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    All ready for a new fitting. Use brass so the next poor bastard doesn't have to go through this too.

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