Approximately what does it cost to sleeve them? Presumably if one bore needs it all must be done? Unless the others are in very good original spec and one was scarred or something?I know that they can be bored .030, but when I was in the business, the machine shop that we used wouldn't go over .020 because they felt that was too thin. If a block didn't clean up at .020, it was sleeved back to standard.