the 5.4L already uses the longest rod I've ever come across in a production motor at 6.658". it's longer than any chebbie or ford big block rod.
The 2V heads are also largely responsible for the massive bias toward tq on the 5.4. With 4V heads the 5.4 tq output is less impressive in ratio to the hp production. It's actually a lot more similar to the 4.6 with somewhere in the 300hp/345tq which is basically ratio equal to the 240hp/280tq that you commonly find in 4.6 2v. the 2v heads limiting of hp production assures that the math of the matter will bias to the other side and boost tq to insane levels as tq and hp are numerically related to rpm. To learn more about predicting hp and tq based on each other, google it.
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