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I just used the 3M black tar-like calk (sp?) strips my HVAC buddy gave me. I think they use it to seal up combustion chambers on forced air furnaces.
It was a bear to get to stick right but I wouldn't go without something to seal it up.
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'70 cab, '71 chassis, 383, TH350, NP205.
'71 Malibu convertible
'72 Malibu hard top
Center City, MN
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