My 81's birthdate is approximately February 19, 1981. I am the second owner.

The windows that came on the vette have the following codes: Drvr's side : I(eye) X, Pass. Side : GX

* I would like to know what LOF date codes the vette should have? According to several LOF date code charts, the month dates I have seem out of sequence.

* Should both the drivers side and passenger side windows have the same date codes?

Thanks,

Jeff D

For judging purposes, a date up to 6 weeks prior to actual build date is normally accepted, but that is the exception. In most cases, parts are more in the 3-4 week window before the build date. As far as the glass all having the same date, it rarely happens, but it could happen. As long as all of the dates preceded the build date by no more than 6 weeks, it would be considered acceptable. On rare occasions glass could be damaged on the line, and replaced with glass that might be dated after the build date, but no more than 1-2 days, at the most. My June build '74 has glass dates from May to June.

Your breadth of knowledge is very impressive!

Years of dealing with NCRS has helped with stuff like this. Restoration "experts" have gathered detailed info on how the cars were built originally, and date codes are important in determining if a part is "correct" for a specific vehicle. There are exceptions, of course, but anything outside of the "accepted" range is up to the individual owner to PROVE. For instance, my June build date car was held "hostage" on the assy line during a worker strike in St. Louis. It had already been assigned a VIN, but was not completed before the strike started. One of the headliners for the t-tops is dated August...the month the strike ended. My AIR pump is also dated after the build date by a couple of weeks. Being able to confirm the car was on the line when it went down explains the "incorrect" dates, and therefore acceptable for judging purposes. 😁
I pass along my "knowledge" because that's how I learned....from someone else....and that's just what we do.