Heater core date code?

[R68GTO]

Do big block heater cores have a date code? If so, where would I find it?

[X66 714]

I would think all Harrison heater cores have a date code. I've seen it on one of the tanks...Joe

[Big Block Bill]

All of the Original GM Heater cores I have seen have been stamped on one of the side "Tanks" with the month (1 Digit) and the year (2 Digits). My LS-6 was a 03D Arlington built and it was stamped 3 70 A good radiator shop can re-core a heater core like a radiator. Bill

[68camaroz28]

Here is an example of the date code on Harrison heater cores dated 67L.
https://www.camaros.net/threads/time-for-another-68-z-28-to-be-restored.182584/page-25#post-1690789

[WorkinProgress]

Harrison cores are what GM used. The end tank opposite the necks, will say Harrison and will have a date code. It will be the last two digits for the year, followed by a letter. The letter represents the month.

- Warren

[R68GTO]

Thanks guys. I'm assuming mine is original but will be nice to document the date code.