Swap 4.9l v8 and 4.6l v8 northstar
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Northstar Engines and System Technical Discussion Discussion, Swap 4.9l v8 and 4.6l v8 northstar in Cadillac Engine Discussion; I have a 1994 Cadillac seville with a 4.6l v8 northstar and the engine went (head gasket leak) and was ...
  1. #1
    rellsun is offline Cadillac Owners Member
    Automobile(s): 1994 Seville SLS
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    QuestionSwap 4.9l v8 and 4.6l v8 northstar

    I have a 1994 Cadillac seville with a 4.6l v8 northstar and the engine went (head gasket leak) and was wandering if a can swap it out with a 1993 deville 4.9l v8?


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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Swap 4.9l v8 and 4.6l v8 northstar

    No. Different trans. Different PCM. Probably motor mounts and other things I'm not thinking about.

  4. #3
    Destroyer Guest

    Re: Swap 4.9l v8 and 4.6l v8 northstar

    Dude just get another car.

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    CaptainFishpond's Avatar
    CaptainFishpond is offline Banned
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    Re: Swap 4.9l v8 and 4.6l v8 northstar

    Drop in an LT1!

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    Highline Cady's Avatar
    Highline Cady is offline Cadillac Owners Fanatic
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    Re: Swap 4.9l v8 and 4.6l v8 northstar

    Why why why if your going through the hassle of switching to a different motor would you ever pick a 4.9? Swap a fwd Impala SS running gear, it'd probably be easier. Personally just stick another N* in it and do basic maintenance and you probably wouldn't be in this situation to begin with.

  8. #6
    801Hill's Avatar
    801Hill is offline Cadillac Owners Fanatic
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    Re: Swap 4.9l v8 and 4.6l v8 northstar

    I think that it would be possible but it would be alot of work and you would run into alot of problems. I think that it would be less work to fix the Northstar. If your up to swapping engines out then you should be able to tackle the HG. I just finished my first HG/headbolts project, biggest job I ever did but I finished it and it works! even with a few extra bolts left over lol. That always happens to me.
    Dont get me wrong I love the 4.9, it always amazes me how much power it has and it will run to 200,000+ miles with no major problems unlike the Northstar HG. The problem is the 4T60E that it is mated to. You will go through 2 of them for every 4.9 engine.

  9. #7
    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: Swap 4.9l v8 and 4.6l v8 northstar

    I have seen a lot of 4.5L & 4.9L Head Gasket failures, so what would the advantage be?

  10. #8
    rellsun is offline Cadillac Owners Member
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    Re: Swap 4.9l v8 and 4.6l v8 northstar

    Well i was going to have a friend do the work and he said its best to get a rebuild or one in good running condition instead of getting a junkyard one. so i saw a 1993 deville with a 4.9 on craigslist for 600 compared to 1000-2500 for a junkyard or rebuilt motor. Anyway didn't think it would work but doesn't hurt to ask.

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