If the engine is labeled DURATEC V6 under the hood.
It should also have a 24V DOHC emblem on the front fenders, but those sometimes fall off or don't get replaced if the car is repainted. Another indicator is if there's NO room in the engine compartment - especially if you start wondering 'how would I ever get to the back sparkplugs" - then you're likely looking at the DOHC.
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.
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
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
A 2001 Ford Taurus came from the factory with either the 3.0L " Vulcan " V6 engine ( and the flex fuel version ) which are an Over Head Valve design or The 3.0 L " Duratec " which is a Dual Over Head Cam engine
The 2006 Ford Taurus has the 3.0 liter " Vulcan " V6 ( or flex fuel version ) It is an over head valve / pushrod design engine
If it's a zx2 it's a dual overhead cam. It it's an LX SPI it's a single overhead cam.
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 )
Ford made 3.0 L Over Head Valve / pushrod design engines and 3.0 L Dual Over Head Cam engines for the Ford Taurus
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
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
For a 1998 Ford Taurus : The 3.0 litre " Duratec " Dual Over Head Cam , V6 engine is rated at ( 200 horsepower from the factory )