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I'm very surprised they even repro'd these in 1977, let alone sold them at Chevy dealerships...
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I can't tell you if it is repro'd or re popped, banged out in SingSing or cooked on a waffle iron in the staff lunch room, but I can say for sure it was sold at the Chevy dealer in 77 or early 78 at the latest.
It saddens me to think I've had that 4NJNK on a dozen cars over the last thirty years.