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One more point. 379 cubic inches of 4 stroke has a theoretical volumetric flow rate of 395 cubic feet per minute at 3600 RPM. Actual flow rate is 350 cubic feet per minute for a volumetric efficiency of 89%. That is impressive for 1980s technology using cast iron heads. This is from the low...

Diesel engines cannot have any valve overlap because there is no room for either valve to be open at top dead center. In performance cam design, this is called a large separation angle. Performance engines are between 106 and 110° lobe separation angle between intake and exhaust lobes. Why...