I would use some 320 grit sandpaper between cylinder hone stones and the cylinder walls (with a lot of pressure on the stones)with either kerosene or jet A fuel as a lube and make no more than 4 complete up and down strokes in each cylinder and then clean the holy be holy on the cylinder wall finish to remove any grit or debris left Change the paper after two cylinders or use them only once depending on what you see and like