One simple answer, technology . The 4.6L 24V "281ci" aluminum block got SOHC 3-valve aluminum cylinder heads and variable-cam-timing mechanism from the new Ford F-150’s 5.4-liter V-8. Engineers have squeezed more airflow efficiency from the heads, in part with a computer-controlled intake flap that varies the port sizes with engine speed. At low speeds the flaps constrict the passages to create a venturi effect and induce turbulence for better charge mixing. At higher speeds they open wide to let past the rushing atmosphere.
But, you can buy a Cammer 5.0L and get 400 horses. riest:
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