1980 Coupe DeVille
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 1980 Coupe DeVille in Past Cadillac Vehicle Discussion; I've got a mint-condition fully original and stock '80 Coupe DeVille. The transmission leaks like crazy and the carb is ...
  1. #1
    ParNT07 is offline Cadillac Owners Member
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    1980 Coupe DeVille

    I've got a mint-condition fully original and stock '80 Coupe DeVille. The transmission leaks like crazy and the carb is on the fritz. is this common? My friend with a '76 Eldo Biarritz Convt. swears it would be smarter and easier for me to switch to a Caddy 500cid V8. I'm a purist and like keepin' cars as original as possible, but I gotta admit I'm concidering this. Anyone got advice or opinion?

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    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
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    Re: 1980 Coupe DeVille

    I can vouch for that being a badass swap. It's basically a bolt-in in your case, and if you get a motor without the smog equipment, you'll DEFINITELY be pleased.

  4. #3
    brougham is offline Cadillac Owners Master
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    Re: 1980 Coupe DeVille

    Unless there's something wrong with the engine it would be easier to just fix the transmission and get arebuilt carb.

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    ParNT07 is offline Cadillac Owners Member
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    Re: 1980 Coupe DeVille

    Well, see, the car's been in the garage for 10 years. Maybe turned on once a month but not actually driven, just idled for a half hour or so. Some of the seals are less then quality but it's not serious by far. I just am tired of constantly fixing the carb. I've had pros do it, I've done it myself, and nothing works! I know the engine's gonna need a rebuild soon (within years, long term) and the idea of a fuel-injected 500cid is something I'd be interested in. Would the 500 bolt to the tranny I have now or would I have to source a new tranny?

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    FASSTWOOD's Avatar
    FASSTWOOD is offline Cadillac Owners Enthusiast
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    Re: 1980 Coupe DeVille

    I'd say go for it.. nothing beats a big block!!!

  7. #6
    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
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    Re: 1980 Coupe DeVille

    368 in it now right? If so, you shouldn't have any problems.

  8. #7
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    tripleyellow78cad is offline Cadillac Owners Fanatic
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    Re: 1980 Coupe DeVille

    Quote Originally Posted by ParNT07
    Would the 500 bolt to the tranny I have now or would I have to source a new tranny?
    your tranny will work with any 472 500 425 or 368 cadillac V-8:coolgleam

  9. #8
    ParNT07 is offline Cadillac Owners Member
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    Re: 1980 Coupe DeVille

    Awesome, thanks. This is new to me I just inherited it and while always a fan of Cadillac have never gotten familiar with them before. Thanks for the input hopefully I can put up some picutres of my car, it's tripple maroon and reallya nice example.

  10. #9
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    MMNineInchNails is offline Cadillac Owners Enthusiast
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    Re: 1980 Coupe DeVille

    Why would you just replace the engine and use the old transmission when the tranny leaks like crazy?

  11. #10
    Imprl59 is offline Cadillac Owners Fanatic
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    Re: 1980 Coupe DeVille

    Quote Originally Posted by ParNT07
    Well, see, the car's been in the garage for 10 years. Maybe turned on once a month but not actually driven, just idled for a half hour or so. Some of the seals are less then quality but it's not serious by far. I just am tired of constantly fixing the carb. I've had pros do it, I've done it myself, and nothing works! I know the engine's gonna need a rebuild soon (within years, long term) and the idea of a fuel-injected 500cid is something I'd be interested in. Would the 500 bolt to the tranny I have now or would I have to source a new tranny?
    I was agreeing on the swap unitl I read the "fuel injected 500cid" part. How are you going to get fuel injection on the 500? Cadi did offer fuel injection on the later 500s (76ish) but that system just doesnt compare to the fulel injection you would get on a new car today. The technology just wasn't there yet. You couldn't find anyone to fix them in '76 and you sure aren't going to find anyone today! The fuel pumps (yes more than one) are getting rare and expensive... so are the control modules.

    Cadi was really ahead of the curve on fuel injection... Chrysler didn't have anything even close until the 81 Imperial and they ended up retrofitting those to a carb because the system was so unreliable (some say the system wasn't that bad, they just did a poor job of training their techs).

    With either engine consider getting a new carb. Edelbrock should have something that will fit your engine. I believe you would be quite happy with the result. Just don't get something toooo big.... 600cfm or under would be plenty for your existing engine.

    If you decide to go the 500 route try to get one as early as you can. 73 and later were heavily modified to meet the smog rules and , while still a strong engine, don't compare to the earlier models.

    Steve B.

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