Nothing beats the chant of an non turbo EMD 567 engine. EMD did come up with a 4 stroke cast block diesel, but it flopped. <br><br>General Electric diesels use cast blocks and are 4 stroke.

GE Aviation has started testing the first T901-GE-900 engine, a turboshaft engine design now in development as the replacement power source for U.S. Army combat helicopters – as well as for the Future ...