Found: 4 340’s

The odds are quite good actually.

As one example, over 5000 T/A blocks were cast for the AARs & T/As. Most of them show one of two casting dates.

It is very possible the cast date is the date the mold was prepared and ready for use VS. an actual casting day for each particular block.

If you can can share the actual engine assembly day for the engine assembly on the front of the block for both of these that would be cool.