dbane261,
That is DYNO PROVEN on a V8, and more specificly, a Ford 4.6. As was stated before, inline sixes have evenly spaced pulses and V8's do not, so the benefits of a cross-over for scavenging would not be univesal. You would really need to show the dyno results of a 235 or 261 chevy engine with and without cross-over to prove any power increase for that type engine. Good sound is subjective and has nothing to do with performance; an engine can sound great and not perform worth spit and vice versa.
