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I would never sleeve a plated cylinder. Plating is superior in every way. It's harder and more durable, has better oil retention properties, better heat transfer rates, expands at the same rate as the cylinder casting and piston, and has better wear characteristics. Sleeves also have problems when installed in cylinders not designed for them. They create ridges and directional changes in the port tunnels because the cylinder casting has to have a larger hole punched in for the sleeve.