Seems like you could clean the corroded spots thoroughly and paint over them with an oil-based paint. That would help protect those areas, but shouldn't interfere with the operation of the blocks. That, combined with the Zerex, should keep the corrosion to a minimum. You would want to take them apart after a few weeks to see how they're holding up.
One potential problem with this is the paint coming off and damaging your pump somehow. I don't think this would be likely, but it's possible.
Does anyone else have any ideas or comments on painting the inside of the blocks?
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