Please Help!! '65 Coupe
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500, 472, 425, 368 Discussion, Please Help!! '65 Coupe in Cadillac Engine Technical Discussion; Hello, So I have a 1965 coupe de ville, the motor has a knock because it ran out of oil. ...
  1. #1
    iggy206 is offline Cadillac Owners Member
    Automobile(s): 2001 Deville DTS
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    Please Help!! '65 Coupe

    Hello,

    So I have a 1965 coupe de ville, the motor has a knock because it ran out of oil.
    I was told it's an Oldsmobile motor, not sure which one exactly, that was swapped in at some point. (i asked why too)

    I have a Buick 430 motor with a TH400 transmission out of a '68 Electra 225.

    I want to know if the Buick motor would fit without any major adjustments, and if it would be better than the olds one? Also which transmission should I use, again I'm not sure which one is in the Cadillac, I think it's original.

    Thank you,

    Igor.

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  3. #2
    iggy206 is offline Cadillac Owners Member
    Automobile(s): 2001 Deville DTS
    Join Date
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    Re: Please Help!! '65 Coupe

    So I found out that the motor in the coupe is a 70's Olds Rocket 455 and that the transmission in it has a longer shaft.

    Which motor do you think would go better? the Buick 430 or the Olds 455?

    O and also does it make sense to use the short tranny and extend the drive line, or use the longer tranny? either way its getting rebuilt.

    I'm a little lost..

  4. #3
    drmenard is online now Cadillac Owners Enthusiast
    Automobile(s): 95 fleetwood 81 deville
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    Massachusetts
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    Re: Please Help!! '65 Coupe

    If the motor in the car has been changed over to a Olds motor, and now that motor is bad I would go with another olds motor... That way there would be nothing to do but swap the motor...

  5. #4
    iggy206 is offline Cadillac Owners Member
    Automobile(s): 2001 Deville DTS
    Join Date
    Dec 2011
    Age
    24
    Posts
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    Re: Please Help!! '65 Coupe

    I've decided to use the buick motor, because everyone seems to think better of it. As far as the tranny, I'm just leaving that alone for now.

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