Real nice explanation RA2, factual & complete.
Now do we throw the issue of high nickle content blocks into the mix with the 2506 and should we start the 4:33 only discussion too?
I put up a thread a while ago that nobody answered regarding casting dates on "as-cast" 2506 blocks - I'm curious if any were cast after the C118 date - can anybody chime in here? I'm trying to determine if that was the cut-off date, and from then on they were all ground and stamped. I believe it's been posted before that nobody has an "as-cast" 2506 RAIV block.....I know mine isn't.