OK Landy lover, its made out of aluminum, but there still has to be a chemical reason for you going through so may heater cores. Is the cooling system being properly flushed or is something remaining in the system (perhaps some cleaning agent)? If you end up replacing the core again, find out if you can have the inside surface coated with an epoxy like is gone with gas tanks - this should stop corrosion. I keep coming back to the idea of some nasty contamination in your system. One final idea, don't laugh, but hook up a voltmeter to the core and see if there is a charge going through it somehow; if there is, ground the core unit carefully.
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