To select the most obviously dangerous race car in race car history would seem to be the sort of conversation that would cause an argument. No digger, turbine or jet engine flying missle of death can compare with the Smokey Yunick 'Sidecar'. Just keep this photo in your wallet and all bar room arguments will grind to a halt. Plus, if the discussion turns to stupidest bumper in the history of automobile racing, you just won another beer.
Four cylinder, dual overhead cam, hemispherical head what-have-you but the powerplant doesn't really matter. This scares me to just look at it. This is like the Exorcist of race cars.
Thanks to Glenn for the fantastic link.