Engine swap

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Northstar Engines and System Technical Discussion Discussion, Engine swap in Cadillac Engine Discussion; I have a 1997 STS with a bad head gasket at 93k miles, I found a 4.6 Northstar from a ...
  1. #1
    mnsundevil is offline Cadillac Owners Member
    Automobile(s): Cadillac 1997 STS
    Join Date
    Aug 2008
    Minneapolis MN

    Engine swap

    I have a 1997 STS with a bad head gasket at 93k miles, I found a 4.6 Northstar from a 1994 to swap, does anyone know if a 94 will work in my 97? And if not what are the differences?

    Thank you all for your help. I'm a new Caddy owner and wasn't aware of the head gasket issue before I bought one.

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  3. #2
    zonie77 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 ETC,97 STS
    Join Date
    Sep 2003

    Re: Engine swap

    A 94 won't work. There are threads that tell you what years work.

    My advice: don't waste time and money on an unknown engine. If yours runs fine, except for the HG's, fix them and be happy. It is only a little more work than swapping engines.

  4. #3
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 ETC (GAVE TO STEPSON 2011), 2000 DTS (RIP)
    Join Date
    Jul 2007

    Re: Engine swap

    zonie is correct - on my '97, I had my first engine replaced with a used engine, due to head gasket failure. When that engine's head gaskets failed, I learned about the proper fix on this forum and chose to repair the engine following advice from zonie and many others. Now I have an engine I can rely on.

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  6. #4
    mikelawson is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac
    Join Date
    Apr 2008

    Re: Engine swap

    A 94 has a few differences in the block, but could be made to work if the price is right. The AC compressor will have one bolt that won't line up and the motor mount on the passenger side will have to be modified as there is a bolt near the bottom of the front cover that is not there on the 94 block. I totally agree that fixing your engine is the way to go.......


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