Video: Watch A Flathead Ford Belt Out 400 HP On The Dyno

The defining feature of a Flathead Ford V8 is the flat cylinder head. But Corvette godfather Zora Arkus-Duntov developed an overhead-valve conversion kit for the Flathead, which increased its performance potential by a ton. These heads are still out there, powering cars like this record-setting 400 HP hot rods.