date code on block

[S7MS427]

Cleveland would cast the block & heads ( my casting date late Oct 65 ) and then assemble the engine ( mine Nov 4, 65 ), the stamped date & shift ID on the oil pan rail face.

Interesting.  I know where to find the assembly date (mine is 5L3, one day ahead of yours) but where is the shift ID located?

[J_Speegle]

Interesting.  I know where to find the assembly date (mine is 5L3, one day ahead of yours) but where is the shift ID located?

At the end /included in the machined date on the oil pan rail

[6S1568]

So the letter "B" at the end of each of these examples is an indicator of the work shift in which the machine work on the block was completed, and not an inspectors mark. Correct?

6 A 26 B
and
5 D 28 B

Thanks

[J_Speegle]

So the letter "B" at the end of each of these examples is an indicator of the work shift in which the machine work on the block was completed, and not an inspectors mark. Correct?

6 A 26 B   and   5 D 28 B

Believe that is the current thought. Only finding A's and B's so far

There are a fair share of other numbers. letters and symbols on the rail also. Those may indicate checks, confirmations and inspections of the block

[S7MS427]

Only finding A's and B's so far

I'm guessing that A would be 1st shift and B 2nd shift?

[S7MS427]

After retrieving my block from another state, I have located two sets of date codes, the a fore mentioned 5L3T on the front of the block and a 5L3E on the oil pan rail below the block casting number.  Any opinions as to what the "E" represents?  Thanks.

[J_Speegle]

After retrieving my block from another state, I have located two sets of date codes, the a fore mentioned 5L3T on the front of the block and a 5L3E on the oil pan rail below the block casting number.  Any opinions as to what the "E" represents?  Thanks.

Had not see/hear of an E yet so thanks. If it identifies not the shift but the week a fifth week is fairly rare annually

If it was worker like used on the assembly stamp then we would see more variations used.

Have not seen anything in any Ford manuals or documents explaining the machining date as there is for the assembly date