Sleeving a cylinder pros/cons

As long as you don't do it like the British a few years back on their Rovers/Honda look a likes. Sleeves where put in from the bottom of the V6's with the thermostat under the manifold between the 2 banks heat would cause the plastic thermostat housing to crack this would cause over heating and yup bet you can guess then the liners fell out wold make a hell of a noise (british at it's best lol)