Interesting info from Kai Spande (Plant Director) on C8 Build Restrictions from the Corvette Blogger site - there is a video as well as the info below:
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These restrictions are some examples, so not the complete list and must make the line planning a nightmare. Line speed is 11.6 C8's per hour. Nothing in this provides any insights into why they are having problems building the Z06's. My interpretation is they could theoretically build up to 40% Z06 as long as only 40%-50% of the Z06's have the Z07 package.