I think the Shivy vs. Hemi with equal footing could be solved by looking at Pro Stock racing in 1970-71. They had the same carbs, tunnel rams, roller cams, etc. Dragging modern PS heads into the arguement vs. Hemi heads that didn't get any development (SS rules fix the valve angles and chamber volume, so that only leaves them the ports to develop) since 1973 doesn't make a good comparison. That sounds like WJ saying how bad the Hemi is. I'd like to ask him if he wants to put the PS rules back to 1970 and see how he fairs. The modern chambers are tiny compared even to the closed chamber rat head. The BB Shivy heads have straightened out the odd ports compared to what they originally had in 1965.