The big bodied 4.6s have detuned engines making less power than their Mustang GT counterparts, often in the form of lower compression. What is the exact engine configurations for say, the later Town Car models('04 on up)? Do they have different cams, pistons, or is it just in the pcm? I've searched to the point of exhaustion but could never find the exact information I was looking for.

I only ask because I very badly want to make a nice Turbo'd car for my new '05 Town Car and one of the first tasks in getting that motor forged. For a goal of around 600 RWHP, can I settle for a rotating assembly, or would I also need heads/cams in addition?

Thank you.

 

Holy Moly...You want a turbocharged Lincoln Town Car?

 

They are exactly the same as the Mustang engine of the same year. Only the PCM and exhaust is different accounting for the power loss. I am working with someone on a similar build, your chassis/powertrain is basically the same as a Crown Vic. To do 600RWHP for any length of time you need head work and can run the stock cams. Stock heads at that power level will wear out the exhaust guide and seat really fast.