[Steve C.]

Let's not forget the origional intention here, and post, to have a rather small port with good flow, and for 455 based combo (or similar, I'm sure). This is a natural.

The origional plans and conception for our set of 400 cfm HP heads was based on a short stroke 482cid combo.

If they had a bigger combustion chamber, my new 505 Pump gas street motor would have jumped alive with a set of "370 cfm" High-Port heads with the better combustion chamber design and additional air flow, and without a large intake runner volume. But they won't fit under my hood !

[WARPed]

Not to sound skeptical but have there actually been a set of ports done that the cnc program was digitized from? If so what are the flow numbers, valve diameters used, width/height and cc‘s of the runners. In the event that this proves out to be true as claimed you will see quite a few HP heads going your direction, and one set might be from me.