I have a 427 block with a sleeve in the number 3 cylinder. The sleeve is slightly recessed from the deck of the block. I can feel the sleeve sticking out on the bottom of the cylinder. There is no step to hold it in place.
The sleeve seems to be recessed roughly 0.010". That's the thin outer silver line in the pic.
Question is what do you do when rebuilding? Just deck the block? Maybe the sleeve will keep migrating down?
Remove the sleeve and redo it with a step at the bottom?