[ecp]

If I may add, the biggest risk with sleeves is that a crack from the underlying damage may propagate out from under the sleeve or close to the edge of it enough for coolant to start leaking. I've heard of some failing and others lasting foreever. My opinion, from a perfectionist and aerospace background, is that welding up the underlying damage before inserting the sleeve would be most ideal. I've had an aluminum block cylinder area welded before inserting a new sleeve and was even able to get at the OD of the discrepant area through the water jacket hole to blend the back side of the weld smooth (certain amount of luck there so that it lined up with the hole). While cast iron blocks are much more difficult to weld, a select few people seem to be able to do a great job at it.