Looking at that beautiful engine I wonder why having exhaust derived hotspots on the inlet manifold was so popular with early engine designs. Can't help carb icing as its well past that.

Now we strive for efficiences of inlet charge cooling especially with turbo engines.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone