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One saying that I heard that has always made sense with engines....
"A 'big' big man is always better than a 'big' little man..."
The Modular engines are displacement-lacking. I can do about 351 cubes with a stroked and re-sleeved 5.4L block. The longer stroke of the 5.4 helps on torque.
However, you usually have to reach for forced induction if you want some good numbers, or usable power. 600hp is do-able with a naturally aspirated 5.4, but you have to spin it up really high.
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