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After getting the motor and pulling off the intake manifold the insides and the water jackets were gummed up with crud. So was it rebuilt?
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No. That kind of crud takes years to accumulate.
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Could the build up in the engine because it sat for such a long time with dexcool in it instead of antifreeze?
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No. Dexcool is antifreeze. It has a different additive package but it still resists corrosion. That type of buildup requires many heat cycles to develop.