sick ht4100
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Cadillac Allante Forum Discussion, sick ht4100 in Past Cadillac Vehicle Discussion; what engine could I swap in?...
  1. #1
    hogdaddy is offline Cadillac Owners Member
    Automobile(s): 79 coupe,87 allante
    Join Date
    Mar 2007
    Location
    omaha,ne
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    70
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    Question sick ht4100

    what engine could I swap in?

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  3. #2
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Re: sick ht4100

    This is posted in the Allante forum and it says you own a 79 coupe de ville?? If in fact, you have an Allante, what year??

  4. #3
    hogdaddy is offline Cadillac Owners Member
    Automobile(s): 79 coupe,87 allante
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    Mar 2007
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    omaha,ne
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    Re: sick ht4100

    It's a recent purchase.....1987 allante silver/red&burgandy.....seems I have a dead cylendar??{near firewall}...But last nite it shut down inflight..Error:Oil

  5. #4
    Allantesource is offline Cadillac Owners Fanatic
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    Re: sick ht4100

    Easiest thing to do is to install a 1989 through 1992 Allante' 4.5. You have to use all the original emissions equip and modules. Footprint is exactly the same. Exhaust manifolds, EGR valve, diverter valve, O2 sensors, and upper intake off old engine all need to be reused. I've never tried to put another non-Allante' Cadillac engine into an Allante'. I know the lower intake is different on Allante's that other Cad's and that is work to swap. Not sure about the heads.

  6. #5
    hogdaddy is offline Cadillac Owners Member
    Automobile(s): 79 coupe,87 allante
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    Mar 2007
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    omaha,ne
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    70
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    29

    Re: sick ht4100

    Any body do a 350 chevy into allante???

  7. #6
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Re: sick ht4100

    Depends on how big the checkbook! 350's were never transverse engines, so you're in for alot of work when the 4100 might just be an injector that quit. And please add the Allante to your profile.

  8. #7
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
    Automobile(s): 93 & 88 Allante, 88 Eldorado
    Join Date
    Jan 2004
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    779

    Re: sick ht4100

    If you're looking for more power (maybe +45 hp), go with a 4.9L cadillac engine and swap over the Allante specific parts including heads and intake manifold. The extra power however might speed up the demise of the F7 tranny which was not known to be that strong to begin with.

    If you can invest more money and want something with a lot of power and unique, install a transverse 5.3L chevy engine. It was used in the newer SS Impalas and some other models as well. With this engine, your car will be slightly faster than a 93 N* Allante.

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