The one that we found was wrapped in plastic. Built intake to pan - can't recall WP. The ZL1 blocks were machined on their own CNC machining center up by the offices - very state of the art at the time. I'm not sure if they were even assembled on the regular production line. I didn't work in the motor plant - just passed by the ZL1 machining center on the way to QC meetings over there.
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