Our last AKEOTD was a Chrysler-built tank powerplant, and you'd think it would be impossible to surpass a five-bank, 30-cylinder monster… but the IV-2220 airplane engine does just that. It's the very first Chrysler Hemi!

Audi will be the featured marque at this year's Festival of Speed, held July 3-5. This is your last chance to see the Auto Union race cars before Audi becomes, by default, hopelessly uncool.