I'm going to guess the unique sounds is partially created by having single choke triple cars. If you work out the timing the pulses thru carbs 1 and 3, is different to the middle carb. Carbs 1 and three have a 240/480 degree firing whereas the middle carb has a 360/360 pattern.
Also I think the smaller size of the block possibly encourages higher resonant frequencyies.
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