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Frank, you missed some 6 valve heads in history. Maserati made in 1985 a 2.0 l -V6 with turbo and 6 valves. 3 inlet and 3 exhaust valves per cylinder.
Also an Italian fan of Ducati once made heads with 6 valves for the twin Ducati.I somewhere have a copy of an article about that bike.
And if I am not wrong around 1935 a France automobile company made a single cylinder with six valves for a car.
regards Jan
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