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Cadillac Powertrain Control Module (PCM) Tuning Discussion, Swapping Northstar for LS Engine in Cadillac Engine Technical Discussion; Not sure if this helps any but this is a link to a guy who swapped out a 6cyl in ...
  1. #16
    Villanous's Avatar
    Villanous is offline Cadillac Owners Member
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    Re: Swapping Northstar for LS Engine

    Not sure if this helps any but this is a link to a guy who swapped out a 6cyl in an impala for the LS4. Few good pics about some of the changes he had to do.

    http://www.cardomain.com/ride/2390354

  2. #17
    N0DIH's Avatar
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    Re: Swapping Northstar for LS Engine

    Cool.

    Maybe when I can get Sandy to give me his 60 I can do a 5.3L swap in it and never pop the hood...

    Thanks! I think this is one of the best swaps for the 85-94 FWD Deville/Fleetwood/60 Special.

    But it also makes a lower cost alternative to rebuilding a blown gasket Northstar with a LS4.

  3. #18
    Cliff8928 is offline Cadillac Owners Fanatic
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    Re: Swapping Northstar for LS Engine

    Quote Originally Posted by benelliwang View Post
    Not so, the difference is the bore:
    3.779" x 3.622 (LS4) vs. 4.000" x 3.622 (LQ4)

    The LS4 bore is smaller then LS1 (5.7), LS2 (6.0), LS3 (6.2), & LS7 (7.0). Other then the LS7, they share the same stroke but different bores.
    The LY2 (4.8) is the one with the shorter stroke just to clear that up...

  4. #19
    fierodough is offline Cadillac Owners Fanatic
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    Re: Swapping Northstar for LS Engine

    Why would you want to get rid of your N*? the N* engine came from a 2 peaice racing block. For less then what it would cost to drop in an SBC or LS, you can be tapping into much much more power with the N* engine.

    I would recomend doing a search on PCM tuning and cam swap. There is a video on the net somewhere of a N* with swapped cams holding 14K RPM for several hours without any faillures.

    Keep in mind that the N* was delibratly tammed down for the Caddilac platform doue to Cadillac's targetted customer base. (Ritered elderly people looking for luxury).

    I'll see what i can digg up and post it here.

  5. #20
    N0DIH's Avatar
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    Re: Swapping Northstar for LS Engine

    Reliability, power and mods are dirt cheap on a LS4 than a NorthStar....

    Simple economics....

    Imagine a 85 FWD Deville with a LS4 in it. SLEEPER.....

  6. #21
    Enano is offline Cadillac Owners Member
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    Re: Swapping Northstar for LS Engine

    Quote Originally Posted by fierodough View Post
    Why would you want to get rid of your N*? the N* engine came from a 2 peaice racing block. For less then what it would cost to drop in an SBC or LS, you can be tapping into much much more power with the N* engine.

    I would recomend doing a search on PCM tuning and cam swap. There is a video on the net somewhere of a N* with swapped cams holding 14K RPM for several hours without any faillures.

    Keep in mind that the N* was delibratly tammed down for the Caddilac platform doue to Cadillac's targetted customer base. (Ritered elderly people looking for luxury).

    I'll see what i can digg up and post it here.

    ever find this video? your sayin a stock N* holding 14k rpms?

    someon said the ls3 is a near bolt in. what kind of welding needs to be done. are we just talking brackets to mount the engine?

  7. #22
    N0DIH's Avatar
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    Re: Swapping Northstar for LS Engine

    LS4, lots of go fast parts, can make stupid amounts of power easily.
    NorthStar, no go fast parts, hard pressed no matter what you do normally aspirated to make over 325 hp.

    LS4 hp/$ is low
    NorthStar hp/$ is high

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