Interesting.... I assumed you were going to mention the reverse cowl hood like you see on many v8 powered vehicles or the hood vent like you see on a hummer. I think in the hummer the radiator maybe horizontal vs vertical so if someone takes a shot at the grill it wont suffer an instant water leak.
![](https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcR5EVvDP-oVINfUcDoMLAUV4cnrwVDc4y6KS5_-rPpIxDVLgYzEkENLI6w)