Just for more interesting data points, my 12D Norwood Z, all of it's sheetmetal dates are 51, yet it's about 400 serial numbers past the first known ZL2 Camaro built which is 569358, I believe the first ZL1 Camaro.
Wouldn't be a stretch to assume it's sheet metal dates would be close to mine, which could make the earliest ZL2 hood date at Norwood a 51.
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