My ZL2 hood is stamped "18", which would be the 18th week in 1969, or April 27 - May 3, based on the link KurtS provided covering sheet metal stamping and date codes. My Z28 is a Norwood 05A build car, so the hood predates my car build date by one week. The code is hard to see and I had to use magnifying glass to confirm the code as an 18 rather than 13.
Should we start a hood date code vs. car build date list similar to the data base started on the gas tank date code vs. the carís build date? I would be curious to see how this tracks, unless sheet metal is typically dated very close to the build date of the car.
If so, I'll start:
05A, hood code 18