One of the gee emm marketing weasels said they were looking at lowering the min equip on a “base” SS so expect a more closely matched base GT competitor in 2019 with the refresh.
The ZL1’s A10 cooler is horizontally mounted up front under the grille. The only documented cases of overheating were mid summer extended track runs in close traffic that impaired airflow into the grille. No issues in clean air.