If its only surface rust that has started since u pulled it apart once its reassembled the rings will clean the bore within 60 seconds of engine running
Honing the cylinder makes it round again and the hone criss cross scratches hold oil when the engine is not being used, if u hone it it will remove that little lip at the top of the cylinders
If u have a lot of calcium and salt build up inside the wayer gallery u can drop your block off to a automotive engine rebuilder and have them clean it the galleries will come out as clean as a brand new block
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