Jay,
Thanks for the encouragement.
I've built some complicated header routines, but use a simpler one usually for the typical Gonkulator to save computing speed. The Bend Radius criteria is a good one (but hard to get such data - usually all you get is a picture of the headers if you're lucky). Usually the header makers don't even give tube lengths or ranges, let along bend radii.
So I do "guess" a little - I penalize the flow of headers that have tight bends, and reward those that don't, eg fenderwell headers or some dyno headers. I think Hooker really did a good job on those 6114 headers - they make basically a right angle turn out of the ports to fit the Unibody FoMoCos, as they must, and yet still perform well, so well that they really don't want much "penalty" in the Gonkulator. I'd guess differently looking at them.
It seems folks don't "Flow Bench" headers very much - kinda like head or intake flows. Exhaust has to flow a LOT of air - all the air the intake took in, plus a few more net combustion molecules, and then mainly that air is about 3x hotter than the intake air so takes up 3x the volume. It's at pressure which helps a little, but still, a lot of air to flow.
BTW in your dyno runs, do you recall where you set those Hooker 2-1/8 adjustables? They say you can adjust the primary tubes from 30" to 38", which, if all the tubes are the same length (are they?) can make a big difference in the peaks.
Really enjoy your testing, pictures, and graphs. 500hp used to be a lot for a pump gas FE. Now it's more like 700hp.
