from wikipedia:

In 2002, Ford introduced a new 3-valve SOHC cylinder head with variable camshaft timing (VCT), improving power and torque over the previous 2-valve SOHC version. The 3-valve cylinder head was first used on the 2002 Ford Fairmont 5.4 L Barra 220 engine in Australia. The 3-valve 5.4 L was introduced to the North American market in the redesigned 2004 Ford F-150.

Vehicles equipped with the 24-valve SOHC VCT 5.4 L include the following:

2002–2005 Ford Fairmont, 3-valve SOHC, 295 hp (220 kW) and 347 lb·ft (470 N·m)
2003–2004 Ford Fairlane G220, 3-valve SOHC, 295 hp (220 kW) and 347 lb·ft (470 N·m)
2004–2008 Ford F-Series, 3-valve SOHC, 300 hp (224 kW) and 365 lb·ft (495 N·m)
2005–present Ford Expedition, 3-valve SOHC, 300 hp (224 kW) and 365 lb·ft (495 N·m) until Ford introduced a 10 horsepower gain, in 2010. Currently standing at 310 hp (231 kW) and 365 ft.-lbs of torque.
2005–present Lincoln Navigator, 3-valve SOHC, 300 hp (224 kW) and 365 lb·ft (495 N·m)
2005–2007 Ford Fairlane G8, 3-valve SOHC, 309 hp (230 kW) and 369 lb·ft (500 N·m)
2006–2007 Ford Fairmont, 3-valve SOHC, 309 hp (230 kW) and 369 lb·ft (500 N·m)
2009–2010 Ford F-Series, 3-valve SOHC, 320 hp (239 kW) and 390 lb·ft (529 N·m) ratings on e85 biofuel