Flow ain't all

Brain,

Alright! So good that someone who knows what they are doing is tackling a new FE head design using modern design criteria. Everyone wants to know "how much do they flow" but most of the beneifts of these heads will come from other improvements .. port shapes, valve locations reducing bore shrouding, combustion chambers aiding in pressure recovery etc..

Here's a great quote from John Kaase from the 460ford.com site to illustrate this point:

"JDM, the heads we have been running as prototypes flow about 420 and 295 CFM. But here's the problem with air flow numbers and computer programs that use them. We can port a set of old A-429 CJ heads to flow 420 CFM. Then port a set of P-51's to flow 420. Finally, the new hemi's flow 420. The exhausts are not that much different in flow, although the hemi has a .140" larger ex. valve and a .050" larger intake valve.
With everything else being the same, same 521" short block, same 273* roller cam, same intake and carb, the CJ would make 700-720 HP, the P-51 would make 800-810, and the hemi would make 900-910. All with the same dry air flow. There is almost 200 HP difference between the CJ and hemi, with the intake air flow being the same. The middle lift air flow numbers on the hemi would be way better, along with bore shrouding, etc. As you can probably tell, I'm not big fan of the flow bench and use it very little. ... Kaase"

Best of luck

Mark