Larry;
I have made that distintion on several occasions in the past, one not too long back. On that occasion I did gave a full explanation of the "Difference" in sleeving & a monoblock. The thread here was on the use of Watertable vs Action Flats. It was pointed out the British did not use the term Watertable. I was not really intending to steal the thread, just point out the British also did not use the term monoblock, When they cut off an old set of bbls & re-tubed them, they called it sleeving.
Some have objected the term sleeving, but it is certainly much more acceptable than Monoblocking, Nuff Said, my original post was in fact quite sufficient.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra