I have seen GTOs with both riveted and non riveted grills. I have been fortunate to have judged 64s at POCI and GTOAA for A LONG TIME. That question has come up several times. Some opinions are both pro and con. I have never seen anything in writing to confirm or deny. My personal thought is a production change early in the 64 build year. No reason to build two different grills otherwise the same.
Maybe an answer will come forth in this thread!!
"Bill"!
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