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Here's the rule of thumb: If your Vette came with the green stuff, stay with the green stuff. The two just don't mix. There is a lot of discussion on this in the past. Just use distilled water and the green stuff.
If you are doing this yourself, take a look at this article. If you just have to go with the Dexcool, a complete flush of the entire system is manditory (but I still suggest staying with the green stuff) https://www.corvetteforum.com/techti...=222&TopicID=2