But what was the rest of the torque curve like?!
The crossflows (like any 2 valve) can be opened up for top end flow at the expense of air velocity which hurts mid load/low RPM performance. Doubt there's many big gains to be found in a four valve, they flow pretty well as it is.
Stock heads are usually a lot better than they 'look'. Some of the restrictions are intentional, either to increase velocity, even out air flow or simply because the some part of the engine can't handle any more air flow (power).
His theory of combustion was pretty weak, and his stuff on carburettors was appalling. I read one of his articles whereby he claimed that excessive venturi velocity would atomise fuel too well, and that atomised fuel would displace air in the manifold and that this would cost power. That just isn't true!
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