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There is about a 1" gap between the bottom of the defroster duct and the outlet in the main horizontal airbox duct that is just below it. Is this gap normal or do I have a problem?
Standard GM design practice, to isolate the noise/vibration of the heater box from the duct and upper dash panel, which would amplify them (like a drumhead).
1966 Defroster Duct
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