I'd never heard of that 360/cyl, but it makes sense. What about the five-banger? = 72 deg...is that what M-B was up to, widening the engine a bit for a smoother ride than a v-6 with more power than a straight four and more compact than a straight 6?

Say, what about radial engines, were they ever made for a land vehicle?

Then there was the old chevy Corvair, didn't it have a flat six, configured sort of like a BMW motorcycle?