That's not true. The combustion chamber is not a full hemisphere in shape and size, it is more like a shallow bowl, and the valves are angled to match that shape. Because it is not a cross flow head, it dispenses with the need for complex valve train componentry. They are a great engine, they produce close to one horsepower per cubic inch in factory form, easy to build and extract big horsepower. I've built dozens of these over the years, the ultimate straight six!
