My guess is that the cylinder would be hard chrome plated, which the melted alloy can be cleaned off the hard chrome if the piston nips the cylinder. But this one looks like it has more stripes than a Zebra. Scrap metal. Barrel and piston might be economical option, but this piston looks like it has seized and kept going after it cooled down or something along those lines. There maybe a lot of alloy dust floating around the main bearing and seals, big ends and little end of the conrod could be contaminated too.
