Perhaps off topic but we keep hearing about unshrouded valves flowing more. Well, open chamber heads on a smog era SBC had better air flow characteristics than the 60's. However, the 1960's era heads made more power and it wasn't just because of higher compression. It was due to the better burn characteristics of the heads or better quench. According to Terry the duratec already has great burn characteristics due to its pent roof design. So my point is this: What's the story with the 3.0 heads? Flow ain't the whole story. Which heads really make more power?
