91 Deville - 4.9 swaps
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HT4100 4.1, 4.5, 4.9 Discussion, 91 Deville - 4.9 swaps in Cadillac Engine Technical Discussion; Wanted to know if anyone out there knows if a motor from a 1991 CADILLAC DEVILLE 4.9 litre will fit ...
  1. #1
    77jack is offline Cadillac Owners Member
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    91 Deville - 4.9 swaps

    Wanted to know if anyone out there knows if a motor from a 1991 CADILLAC DEVILLE 4.9 litre will fit into a 1991 CADILLAC SEDAN DEVILLE 4.9 Litre? About to try to get it installed because I have 2 blown valves in my SEDAN DEVILLE.. Anyone out there know about this?

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  3. #2
    Submariner409's Avatar
    Submariner409 is online now If it won't run, slap in a big stereo
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    Re: 91 Deville

    Let's move this to the proper forum - Engines, 4.9.

  4. #3
    the recluse is offline Cadillac Owners Connoisseur
    Automobile(s): 2002 STS, 1991 Eldorado
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    Re: 91 Deville - 4.9 swaps

    Quote Originally Posted by 77jack View Post
    Wanted to know if anyone out there knows if a motor from a 1991 CADILLAC DEVILLE 4.9 litre will fit into a 1991 CADILLAC SEDAN DEVILLE 4.9 Litre? About to try to get it installed because I have 2 blown valves in my SEDAN DEVILLE.. Anyone out there know about this?
    No, GM built two different 4.9 motors specifically for those two models...one was 4.9liter and the other was 298 cu.in...

  5. #4
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Is this a serious question? You're asking if a 4.9 from a '91 Deville is compatible with a '91 Deville with a 4.9.

  6. #5
    the recluse is offline Cadillac Owners Connoisseur
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    Re: 91 Deville - 4.9 swaps

    Quote Originally Posted by MoistCabbage View Post
    Is this a serious question? You're asking if a 4.9 from a '91 Deville is compatible with a '91 Deville with a 4.9.
    Hence my response, lol

  7. #6
    brougham is offline Cadillac Owners Master
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    Re: 91 Deville - 4.9 swaps

    There might be problems. One of those engines is two doors short of a full car.

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