4.5 engine swap

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HT4100 4.1, 4.5, 4.9 Discussion, 4.5 engine swap in Cadillac Engine Discussion; Hi, I was looking all over the forum for my question but was unable to find the answer, maybe I ...
  1. #1
    dany7630 is offline Cadillac Owners Member
    Join Date
    Jul 2005

    4.5 engine swap

    Hi, I was looking all over the forum for my question but was unable to find the answer, maybe I wasnt looking right! Anyways, I have a 1990 eldorado and I am looking to change the engine. I have found a 4.5 engine from a 1990 deville and was wondering if it will fit my eldorado, i think it should because it is the same engine, but will it bolt on correctly? I was also considering the 4.9 engine, but I know I need to change the transmission and possibly the ECU, will it be complicated to do? or should I just stay with the 4.5? Thank you for your help.

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  3. #2
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
    Automobile(s): 93 & 88 Allante, 88 Eldorado
    Join Date
    Jan 2004

    Re: 4.5 engine swap

    The 1990 4.5 from the Deville and Eldorado are identical.

    I don't know the answer on what it would take to put in a 4.9 in your car. I believe the transmissions from 1990 on up are the same. Both engines are Port Fuel Injection. Hope someone can answer your question.

  4. #3
    nickh is offline Cadillac Owners Member
    Automobile(s): 90 sedan deville 87 coupe deville (project)
    Join Date
    Dec 2007

    Re: 4.5 engine swap

    Are you from lincoln/omaha. If you are come buy my engine off of craigs list :]

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