Cylinder Head Porting and Power Production

Thanks for the honest answer Dwayne. I'm not ashamed of it falling short, was my first 'real' engine build, can't expect perfection first time around. Could be there's more to this engine building stuff than meet the eye. Seems like part one of the challenge is to make it run but part 2 is to make it run good.

David Vizard says if you can net 1.35 ft/lbs. per cube the combo is efficient. In the case of my 416", that would be 561 ft./lbs. so based on that somewhat arbitrary (though based on lots of experience) number, I'm way off.

Not to make this all about my under-performing combo but it seems my main question here is not about how much head flow will produce X amount of power but instead how to best utilize the given flow of a set of heads to achieve maximum potential. It's the age-old question I guess. Obviously the set of heads I have hold the potential to make more power but for whatever reason(s) they're not.

1.35 ft/lbs/cube is a pretty stout number that few achieve in your average run of the mill street build. It's a great barometer to strive for but its easier said than done IMO. That being said your post is a great segway for a 407 cube SBC that I reworked in the spring that made 588hp/564 tq with Dart heads that flowed 285cfm when I was done with them. This is right @ 2.06hp/cfm and the customer reports that it is ridiculously fast and responsive--engine previously dyno'd @ 530 hp/525tq same heads that flowed the same peak--My work pumped up the .300-.500" curve quite a bit. I know I strayed from the SBM platform-broke my own rules--lol. J.Rob