T12302DQ decoding help

[JChlupsa]

can't find anything for 2DQ or just DQ this is a 512 block

[x77-69z28]

What year block is it?

[JChlupsa]

Want to say 71. Don't have the casting date 😩

[PeteLeathersac]

'

Possibly a Marine use suffix?
Any other stampings on the pad or elsewhere on the block?
Is/was the block bare when you got it or any other parts attached that may offer more clues?
Good luck Jeff also hope all's well in your world!
<<GRAEMLIN_URL>>/beers.gif
~ Pete

[Tracker1]

Just to be clear, is this a 3959512 small-block or a 3963512 big-block?

[SS427]

It's a 3963512 big block.