From another thread here, a member sent me the pictures below, of a CE block with the following dates:
Pad Stamp: CE9A24283
Casting Number: 3932386
Casting Date: J 12 8
This was very interesting for me, because the assembly stamp is only 5 numbers earlier than a CE block that I have, with the following numbers:
Assembly Stamp: CE9A24288
Casting Number: 3956618
Casting Date: A 9 9
So comparing the numbers, there is approximately 3 months between casting dates (October 12, 1968 to January 9, 1969), yet the Flint assembly sequence numbers stamped on the pads are only 5 units apart.
Previous thread contributors have confirmed they have seen CE9, CE9A, CE9B and CE9C prefixes for Flint V8 assembly. Based on the block of sequential numbers allocated to that plant, this equates to over 90,000 CE blocks for the 1969 model year. With this number of service blocks, there can't have actually been a 3-month gap between 5 sequential units being machined and assembled. One possibility is that the 618 block was machined shortly after casting and the 386 casting remained on the rack until January of '69 before it was pulled out and machined just prior to the 618, but another possibility is that a quantity of raw castings was routinely set aside for CE applications, and perhaps both of these pictured were assembled some time after casting.
It would be great to get some more data points if anyone else has another block with a reasonably close assembly number.