40/41 blocks sleeved

[3W Hank]

The blocks at Mercury 40 and 41 has both the std bore at 3.1875", and as I read some had sleeve from factory.
What wall thickness on the ( thin sleeve ) I don't know but wall was maybe 0.04" thick from factory is my guess, or ?
But I seen a std 40 block and it was sleeved from factory but it look way thicker wall on sleeve than ex 0.04".
But question is, why would this block design 'dance' ?
Ok, the factory was thin wall my guess and less bore, but if try go bigger bore say 3.375" or even 3.7/16" is there when the 'dance' issue comes in ?

If 1 sleeve in a block, what is the wall thickness do one like to see ?

When I bought the 41 Merc block I has 1 sleeve included to a bore the block at 3.500", so at a cylinderbore at 3.3125" the wall would be 0.0937".

If one use 8 sleeves like that ( bore 3.500" ) and go 3.7/16" or 3.4375" the wall would be only 0.0312".
-Maybe a block can't handle that.