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I think the pistons are MCs. the cylinders look like stock 912 birals. the new one available in the last say 4 years have been nicasil. but the original sc were ferral(metal spray) vice Nicasil(plated) process. that process was developed by nsu for the wankel. Porsche then used Nicasil for the 917. hard chrome was used earlier for the 906 non 2ltr carreras and early supers. cheers
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