Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, Swapping my CTS??? in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I wanna swap my CTS for a 2007 2.8 Engine with 95k miles on it. Is it worth it?
AFAIK The 3.6 is the same as the 2.8 except that the block is bored to 3.6 that's it.
May I ask why you want to do the swap? If it's for fuel mileage I don't think you will see much of a benefit as the EPA rated mileage is reported to be the same. Also if your engine has an issue what is it?