What motors will work in a 1999 Cadillac DeVille D'Elagance
That's right your stuck with the Northstar system. Oh you can find some people that have put other engines in there but it not same as a Northstar and they are not,the same after all that work changing and modifying to get some other drivetrain in there. So if your needing another engine and are going to keep the car a long time then do some research on engine rebuilders, make sure they do the stud insert modifications on the rebuilds, also get one with a good warranty, so if something does happen it is covered. Just remember the tranny can also go at anytime now so there is also that to consider.
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