340 6 pack more valuable?

340 Mopar
How would they know what number to put in the casting for core shift until the block is poured and inspected.There is no way to tell how much core shift before it is made! If that was the case they could make them all with no core shift and all would be "340" with no more numbers in the casting! I have no idea what the last digit or number means but I bet it has nothing to do with the quality of the block,core shift etc. Simply because there is no way to know in advance when the casting number is or was installed! :scratch: