Quote:
Originally Posted by unruhjonny
I just noticed this and figured I'd reply:
If my numbering is correct, G309 would be July 30th 1969;
Since July was the last month of the production year, and I have understood that the last of the prior model years cars would be produced early in the month of July, it stands to reason that something cast on the second last day of July would probably be used for something produced for the following model year.
I think it is common to see items cast in August as being for the new model year, and if my memory serves me, it seems to be quite rare for anything cast after June to be used for that same model year.
I would guess that in this case, we could conclude that when that block was cast (on July 30th 1969), the "70" was there to indicate that it was being cast for the 1970 model year.
Was that block cast with the '914 casting number?
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They were already using the "70" cast 914 block as early as mid June. My 69 Baltimore built Gto convertibles block was a 914 and was dated F199 (or F239, I don't own the car any longer to confirm).