how large a bore with a sleeved block?

Glidden was ONE of several racers that had furnace brazed blocks. Dyno Don , Lee Hunter , Gapp and Roush, all had them. They were done in Michigan and there was a 50/50 chance that the block would be usable afterward. The "prepared" block with chromoly sleeves in place was placed in a huge oven/furnace to melt the brazing material an essentially create a "one piece " block . The block then had to be carefully cooled ( very slowly) to prevent cracking. The block had to be completely re machined as the extreme temperature in the oven caused the block to "move" a bit. The process was VERY expensive and most Pro racers only had one if any.
okay, not practical but just curious.