I keep thinking your sound deadener is upside down. I think those black strips are intended to be on the metal and soften when warm and stick down to reduce vibration. Probably wrong, but it's worth looking into.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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