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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, engine swap in Past Cadillac Vehicle Discussion; Looking ahead I've been talking to several mechanics about swapping out my 5.7l engine in my 1991 cadillac brougham hearse. ...
  1. #1
    soleman10 is offline Cadillac Owners Member
    Automobile(s): 1991 fleetwood brougham commercial chassis
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    engine swap

    Looking ahead I've been talking to several mechanics about swapping out my 5.7l engine in my 1991 cadillac brougham hearse. I'd like something a little more aggressive, but I don't plan on street racing it. Any suggestions as to what I might go for?
    Thanks in advance

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  3. #2
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Quote Originally Posted by soleman10
    Looking ahead I've been talking to several mechanics about swapping out my 5.7l engine in my 1991 cadillac brougham hearse. I'd like something a little more aggressive, but I don't plan on street racing it. Any suggestions as to what I might go for?
    Thanks in advance
    I'd suggest a built 350, a vortec 454, olds 455, or pre '73 caddy 472/ 500. All of these would require upgrading your transmission and possibly the rear end.

  4. #3
    ferrisworld is offline Cadillac Owners Fanatic
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    Re: engine swap

    I'd go for one of the newer LS series engines. Maybe get the 6.2 from the current Escalade or something.

  5. #4
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Quote Originally Posted by ferrisworld
    I'd go for one of the newer LS series engines. Maybe get the 6.2 from the current Escalade or something.
    That would be cool, but they are not a direct bolt in (as far as I know)

  6. #5
    Cadillacboy's Avatar
    Cadillacboy is offline Cadillac Owners Connoisseur
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    Re: engine swap

    I had a chance of owning Escalade Vortec 6.0 engine and that was a beast , it rolled off the line like streak despite 2.5 tons lol . Still, for some reason I love LT1 over it

  7. #6
    Vladillac Khrougham's Avatar
    Vladillac Khrougham is offline Cadillac Owners Member
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    Re: engine swap

    Will a Cadillac 500 cid engine bolt in to a late model Brougham?

  8. #7
    csbuckn is offline Cadillac Owners Master
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    Not a direct bolt in but I put one in a 90 brougham.

  9. #8
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Quote Originally Posted by csbuckn
    Not a direct bolt in but I put one in a 90 brougham.
    I'd imagine if you got the mounts and proper shroud/ trans xmember/ misc from a 77-81 caddy powered RWD, it would be fairly straightforward.
    (Granted, putting a chevy 350 in my 86 wasn't exactly plug and play either- had to do some GM parts bin scrounging as some parts from the 90-92 wouldn't work)

  10. #9
    Vladillac Khrougham's Avatar
    Vladillac Khrougham is offline Cadillac Owners Member
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    Re: engine swap

    Quote Originally Posted by cadillac kevin View Post
    (Granted, putting a chevy 350 in my 86 wasn't exactly plug and play either
    I often wonder if it's worth the effort to bore out my 305 to a 350. I guess I will cross that bridge if/when other major engine work is becomes necessary. Already have 175K over 170K of which were put on by a previous owner.

  11. #10
    ferrisworld is offline Cadillac Owners Fanatic
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    Re: engine swap

    There are kits to bolt LS series engines right in. They're mainly intended for the 94-96 Impala crowd, but should work with any B, C, or D body from 77 - 96.

  12. #11
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Quote Originally Posted by ferrisworld
    There are kits to bolt LS series engines right in. They're mainly intended for the 94-96 Impala crowd, but should work with any B, C, or D body from 77 - 96.
    I thought you had to notch the frame for the alternator or AC compressor or something

    ----------

    Quote Originally Posted by Vladillac Khrougham

    I often wonder if it's worth the effort to bore out my 305 to a 350. I guess I will cross that bridge if/when other major engine work is becomes necessary. Already have 175K over 170K of which were put on by a previous owner.
    I'd just swap in a 350 instead of having the 305 bored out. You could reuse the accessories/ brackets, exhaust manifolds and intake (you can reuse the heads too, but I'd get some better ones.) If money allows, I'd rebuild the 350 (or at least refresh it.)

  13. #12
    brougham is offline Cadillac Owners Master
    Automobile(s): 1991 Cadillac Brougham D'Elegance 5.7 Litre
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    Re: engine swap

    There's lots of performance mods out there for 350s and crate engines to buy. It's cheaper going that route then changing to a different type of engine.

  14. #13
    stoveguyy is offline Cadillac Owners Connoisseur
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    A 305 cannot be bored large enough to fit 350 pistons

  15. #14
    ferrisworld is offline Cadillac Owners Fanatic
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    Re: engine swap

    A lot of people do notch the frames for the LS engines to clear accessories, but I think there are other ways around it. There may be some factory accessory setups that don't require notching.

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