ALUM HEADS

OK - visited the page and can see variations in the performance of each of the 
heads but not consistently across all the variables. What does it all mean? Is 
one of these charts a proxy for horse-power or torque? I guess I'm a little 
surprised that the 8 port heads don't look a whole heap better than the 5 
ports.....Can someone please explain what I should do with all this info?
 
Scott Graham
60 BE 1275
63 BJ7