2004 Police Interceptor, does it have SOHC or DOHC?

copy and paste
https://www.startmycar.com/us/ford/crown-victoria/info/fusebox/2004
https://fuse-box.info/ford/ford-crown-victoria-2003-2011-fuses-and-relays

Ford Crown Victoria Police Interceptor,

https://www.google.com/search?q=%E2%80%8BFord+Crown+Victoria+Police+Interceptor+canister+vent+valve+diagram

..

Answered comprehensively here in 2015

https://www.fixya.com/answer/answerpageslideview.aspx?thid=29851942&ctg=231&brd=6568&fml=7

https://www.google.com/search?q=2011+ford+crown+victoria+police+interceptor+map+location

..

Ford Crown Victoria Questions - what would cause a whole ...

www.cargurus.com > Questions > Ford > Crown Victoria
CarGuruswhat would cause a whole car vibration when going between 48 and 65 mph, even ... Asked by Dfranz Aug 29, 2013 at 11:53 AM about the 2001 Ford Crown Victoria Police Interceptor ... You have an open diff by turning one wheel the driveshaft should turn before the .... 2007 Ford Crown Victoria Police Interceptor For Sale.

a ha moment interceptor uses the highest out put available if not custom

Notorious for intake leaks, the composite plastic intakes crack and leak coolant-as to the lack of power, you mght have overheated it and done some damage to the engine. There was a recall (information below) for the 4.6 for the intake-the overheating and lack of power means you should at least have compression checked and go from there-you may have bad head gaskets or worse. Do a compression test before you do anything else.

Ford Motor Company will extend the recall (01M02) on 4.6L V8 equipped vehicles with plastic intake manifolds. Some of the composite intake manifolds used on 4.6L SOHC engines may develop fatigue cracks at the coolant crossover duct. This condition could result in engine coolant leakage which, if not serviced, may cause engine overheating. Complete loss of coolant may result in engine damage or engine failure.
The updated recall now includes:
• Certain 1996 through 2001 Model Year Crown Victoria Police Interceptor
• Certain 1998 through 2001 Model Year Crown Victoria with Taxi
• Certain 1998 through 2001 Lincoln Town Car Limousine and Livery Prep Package
• Certain 1996-2001 Crown Victoria Taxis, Police cars and Lincoln Town Car Limousine and Livery cars.
• Certain 1996 through 1997 Crown Victoria Police Interceptor Vehicles with 4.6L SOHC engines built at the St. Thomas Assembly Plant from the beginning of production for the 1996 Model Year through January 28, 1997.
• Certain 1998 through 2001 Crown Victoria Police Interceptor Vehicles with 4.6L SOHC engines built at the St. Thomas Assembly Plant from November 22, 1997 through December 15, 2000.
• Certain 1998 through 2001 Crown Victoria Taxi Vehicles with 4.6L SOHC engines built at the St. Thomas Assembly Plant from November 22, 1997 through December 15, 2000.
• Certain 1998 through 2001 Lincoln Town Car Limousine Prep Package and Livery Vehicles with 4.6L SOHC engines built at the Wixom Assembly Plant from November 22, 1997 through December 15, 2000.

Go to online store reliable they have repair manuals I am sure you will get the solution.
Here's the link
Best Manuals

Make sure to Replace the Rings also and they will be Fine unless the Heads are Warped.

Depends on whether or not you are going with Brand new or are Going to Machine the Old ones. Which way you goin????

Yes they are as long as the Motors are Similar.