I pulled my engine to find it was .060 over already. I wanted to sleeve all 8 cylinders but that was too pricey and most machine shops laughed at me. Most of the engines I work on are sleeved and they typically run 25000+ hours between overhauls. Even then the sleeves aren't necessarily replaced, just honed. The truth is that a sleeve can be made of materials with better wearing properties than the block and because the entire block doesn't have to be cast of that material, it saves the manufacturer a lot of money. It is also nice that if a cylinder is damaged, the sleeve can be removed and replaced. Most of these engines are stationary mounted and too large to be brought to a machine shop to have a cylinder bored.

I am in favor of sleeves.