2 per cylinder , the 3 valve per cylinder heads were used in the F-150 starting with the 2004 model and I believe in the Ford expedition starting with the 2005 model
The 2002 Ford Escape has 16 valves.
The 2002 Ford Taurus has 12 valves.
The 2002 Ford Focus has 16 valves.
The 2002 Ford Explorer has 12 valves.
The 2002 Ford Expedition has 16 valves.
The 2002 Ford Mustang has 12 valves.
The 2002 Ford F-150 has 12 valves.
The 2002 Ford F-250-Super-DUTY has 16 valves.
The 2002 Ford F-350-Super-DUTY has 16 valves.
The 2001 Ford Mustang has 12 valves.
The 2007 Ford Escape has 16 valves.
The 2011 Ford Mustang has 24 valves.