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Thought I'd share this with you guys to help in your decision to recore with balsa or composite.
This is from Composites Technology, Oct. 2003
A common rap against balsa wood cores, particularly in the marine industry, is that the material will rot in the presence of fresh water. But marine specialists say moisture uptake occurs only when spaces between the cut core squares are not completely sealed with laminating resin or bedding compound, or if deck fasteners that penetrate the cored laminate are not properly gasketed and sealed against rainwater intrusion. Resin infusion molding methods evacuate air under vacuum pressure, ensuring that all voids fill with resin. Properly fitted interior insulation material also can help resist water accumulation from condensation, caused by temperature differences between the inside and outside of the hull.

Whether it's actually had water in it or not, it can get wet and rot from condensation. Original 'Streams have had more than enough time for this to happen.

The problem with HydroStreams is times were tough and resin cost a lot. Holding back on resin allowed moisture to wick into the balsa core. If properly sealed, only the moisture in the wood fibers at that time would be effected by condensation. Keeping your balsa stored in a warm dry room just prior to installing is preferred.

I understand what you're saying. Unfortunately, practically all old 'Streams need a recore. It is almost impossible to totally seal anything. The post was just to inform you guys why a boat that was kept dry might still have core problems.