I have only had my motor apart 1 time thank god,All I noticed is that niether cylinder wall had been dammaged when I ran her out of antifreze(water pump failure).There was only small amounts of deposits which came off with a stone cylinder hone (LOW SPEED)doust in oil to minimize cutting into walls.Realy nice and clean not quite shiney like CHROME would be on your bumpers.I have a Sleeved set I'm not useing one of them is questionable.Where they cut to fit in the sleeve they knocked off the old skirting which would help support the wall on bottom stroke.I dont think its unuseable I would have to post a picture and get oppinion.They are .040 overbore and they guy I bought that sled from blew it up,So it is still in pieces and used for parts when needed.I have the whole motor and reconditioned cylinders but I think I want to hold on to them.If you need parts RECLIESURE SPORTS in MI has a piston they sell that comes with all you need,PISTON,Cage,Pin,Cir clips,Rings one price.It would cost with the gasket set about $140 to rebuild that motor.