[olddog]

Patrick - were you talking about the total sound ie lifter tappet, or only the exhaust note?

I have to say that for an exhaust note only, engines of similar bore, stroke, ports, valves and timing will sound the same if they talk through the same exhaust pipes. Although when the cam gives a wild idle, the mass of the rotating assembly would have to matter. The heavier mass would have to smooth out the idle. On second thought maybe the mass would make a difference on the sound wave too.

Ok now my curiosity has the better of me. Can anyone come up with a 427 W and a 428 FE with similar cam grind and pipes?