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Thread: '91 4.9 installed in a '85 Seville-can it be done and any thoughts

  1. #1
    Duane Hayes is offline Cadillac Owners Member
    Automobile(s): 1985 Seville
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    '91 4.9 installed in a '85 Seville-can it be done and any thoughts

    Without me going through all the posts here, wondering if the 4.9 is a direct bolt in to replace a 4.1 in a 1985. I realize that the computer and engine controls are probably somewhat different. But I would just use all the 4100 controls and computer, and perhaps the computer wouldn't know the difference in the increased displacement. I didn't see a search option here on the site to search this question, maybe I missed this. Duane


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  3. #2
    BigCadMan_1's Avatar
    BigCadMan_1 is offline Cadillac Owners Fanatic
    Automobile(s): 93 Eldorado 4.9, 95 Fleetwood 5.7 LT1.
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    Re: '91 4.9 installed in a '85 Seville-can it be done and any thoughts

    This thread will give you all the info you will need to use a 4.9 block in the 4.1 application.

    http://www.cadillacforums.com/forums...4-1-4-9-a.html

  4. #3
    carnut is offline Cadillac Owners Master
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    Re: '91 4.9 installed in a '85 Seville-can it be done and any thoughts

    On a 85 Seville the engine faces forward and the trans sits beside it unlike a newer front wheel drive engine where the engine is sideways. A 4.9 will not bolt up to your transmission number one and the engine block casting wont allow a proper engine driven fan. a 85 DeVille can be adapted to a 4.9 as you've seen in the above posters link.

  5. #4
    Duane Hayes is offline Cadillac Owners Member
    Automobile(s): 1985 Seville
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    Re: '91 4.9 installed in a '85 Seville-can it be done and any thoughts

    Thanks so much, that's information I didn't know about, appreciate your help for sure! Duane

  6. #5
    caddeville's Avatar
    caddeville is offline Cadillac Owners Enthusiast
    Automobile(s): 1991 Deville / 1989 BMW 635csi
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    Re: '91 4.9 installed in a '85 Seville-can it be done and any thoughts

    Make the transmission fit....Use electric cooling fan..or two small ones...


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