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Hi When comparing roots blown 567 and 645 engines, I've noticed that 567 engine has a certain "chugging" sound, that 645 lacks.  It seems to me like 645 engines have a much smoother sounding exhaust, while 567 have this periodical pounding, or a very distinghuished exhaust note.  I'm sure anyone who has ever heard a 567 engine, knows what I'm talking about But I'm confused , because, I though there isn't that much difference between these engines, exept for larger bore diameter (even the stroke is the same) and that it is even possible to convert 567 to 645 So, does anyone have any idea what makes the difference in sound? Why  does a 567 go chug-chug-chug-chug under load, while a 645 goes more like a continuous thunder  Is the sicret in exhaust manifolding? Or something else?
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