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John, I think the roadster in your photo is the Cro-Sal Special, a Cheetah that had the roof lopped off to aid cooling of the driver. Cheetahs get hellishly hot inside...
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I never heard of that car but it's possible.
I guess they did get hot - the engine was so far back in these things that the driver's legs were actually between the headers and the block - the headers went straight out to the side, over the driver's legs and then down just inside the bodywork and alongside the legs.
The engine was so far back that there was no driveshaft - the transmission hooked directly to the differential. I can imagine the vibrations.