If you change the whole engine.
single ober head cam
The 2002 Ford Focus has double overhead cam (DOHC).
Go to NAPA and buy a repair manual for your specific car.
The 2002 Dodge Durango has single overhead cam (SOHC).
The 2002 Ford Explorer has single overhead cam (SOHC).
The 2002 Nissan Quest has single overhead cam (SOHC).
The 2002 Subaru Impreza has single overhead cam (SOHC).
The 2002 Mitsubishi Lancer has single overhead cam (SOHC).
The 2002 MINI Cooper has single overhead cam (SOHC).
The 2002 Volkswagen Golf has single overhead cam (SOHC).
The 2002 Acura TL has single overhead cam (SOHC).
The 2002 Subaru Legacy has single overhead cam (SOHC).