There is an easy way to tell if your Ford Focus is a single or dual cam shaft. If it is single, it will have one gear with a belt around it.
You either have the 3.0 liter " Vulcan " V6 engine , which is an over head valve / pushrod design or the 3.0 liter " Duratec " which is a DOHC ( dual over head cam ) design
you could have the 3.0 L - " Vulcan " - over head valve ( OHV ) engine or the 3.0 L - " duratec " - dual over head cam ( DOHC ) engine in your 1997 Ford Taurus
The Mercury Sable and the Ford Taurus will have DOC in printed on the engine if they are dual overhead cam engines. The symbol should be on the top of the engine.
In a 2001 Ford Taurus : ---------------------------------------------------------------------------------------------------- The 3.0 " Vulcan " V6 engine , and its flex fuel version is an ( Over Head Valve / pushrod design engine ) ----------------------------------------------------------------------------------------------------- The 3.0 " Duratec " V6 engine is a ( Dual Over Head Cam design engine )
The 2005 Ford Taurus was available with ( 2 ) different engines : The 3.0 L " Duratec " V6 which is a Dual Over Head Cam design and the 3.0 L " Vulcan " V6 which is an Over Head Valve design
You can look in a manual for this car, or Google it.
On a 1997 Ford Taurus : The 3.0 " Vulcan " V6 engine is an Over Head Valve / pushrod design engine The 3.0 " Duratec " V6 engine is a Dual Over Head Cam design engine
DOHC
A 2003 Ford Taurus was offered from the factory with either the 3.0L " VULCAN " V6 engine ( and the flex fuel version ) which are OHV ( Over Head Valve / pushrod design engines ) or The 3.0L " Duratec " V6 engine which is a DOHC ( Dual Over Head Cam ) design
The 2000 Ford Taurus had 3 different engines available :The 3.0 liter " Vulcan " and the 3.0 liter " Vulcan " flex fuel version , they are both over head valve / pushrod design enginesThen there was the 3.0 liter " Duratec " which is a DOHC design
The 2006 Ford Taurus has the 3.0 liter " Vulcan " V6 ( or flex fuel version ) It is an over head valve / pushrod design engine
On a 2001 Ford Taurus : The 3.0 liter " Duratec " V6 engine is a Dual Over Head Cam design , so their are ( 2 ) camshafts on the top of each cylinder head , for a total of ( 4 ) camshafts