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Sheesh. I'm not sure anymore. I'm going on training from '78. I actually understood the design concepts of cylinder head design, valve angle, lift and duration, and intake and exhaust for maximum scavenging, which almost always entailed some air/gas mixture flushing out the spent gases into the...

They are right. Backpressure (from a certain exhaust design) is needed for proper 'scavenging', the spent fuel being drawn from cylinders. Too little backpressure, and you don't clean the cylinder, same as too much (simplified explanation). Tim