Keith, thanks for the laugh!
Greg, that is a wide gap for '68 I think. By the mid '70s, the gaps became a lot less consistent, as the years went on wider spreads became more common by what I've come across.
The last of the Pontiac 400 blocks from what I remember learning years ago were cast in Nov. '77 and eventually found their way into the 400 powered TAs and Formulas built as late as May '79 IIRC. But of course that is a special case.
Is your EUN consistent with the cast date or did the block sit around awhile before becoming part of the engine assembly?
I once came across a block cast as I remember it in Feb '65. Somewhere I have details of this story but just going by memory at the moment. It did not involve a GTO. As I recall, it did not become part of an engine assembly until early in the '66 Model Year. Since the casting p/n hadn't changed, there was no reason for the block not to part of a "next model year" engine assembly but it seemed so illogical for a Feb cast block to have sat for that many months without becoming part of an engine assembly.
It was so unusual in my experience that I wondered if perhaps the cast date tag was a foundry mistake and that it was cast much later than the Feb date suggested by the cast date tag.
No way to know for sure but I just chalked it up to it being an anomaly that was out of step with what we typically see.
You might think it was a restamp but the evidence did not indicate that either.
In the end, it just "was". No need to draw any conclusion about it but it was fun for me to study that particular anomaly. Without knowing what is typical, I would not have known whether it was unusual or not. I'm fascinated by these and many other nos., so sue me!!!
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