WTF pictures

I found photos of this engine with no explanation what it’s from. I found the highly unusual looking, exhaust manifold interesting with its large curved cooling fins. Anyone ever seen something like this?
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Half the ducting is missing, as that big duct on the left (from a big centrifugal fan driven by the crank) is for forced-air head cooling and the offshoot that would cover the exhaust is for cabin heating..
The individual carb per cylinder makes it unusual for a factory beast.
 
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Honda 1300

Wow! You are correct, how in the world did you get that? It’s a pretty obscure car.
IMG_8626.jpeg

For anyone interested, here is an article on that engine.

https://www.honda-1300-coupe.com/engine.html
 
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