Quote: The letter was the model year series indicator, it would not have been stamped into a warranty or service assembly because the model year car it would eventually be used in would not be known in advance.
3 = month 6 = day 9 = could have been the sequence built that shift (9th engine, etc.)
*A picture of the pad would be easier to decode.
Scott that makes sense but I can't recall ever seeing a '69 block done like that? Here's one I saw on ebay a while back. The casting date was 11 15 68 but I can't see how 1 2 8 could work out to Jan 2 68? I see the "S" 440 the W ater T est, the "A". I totally agree with your "*A picture of the pad would be easier to decode."
