Puttting a '66 motor into a '68 Car
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500, 472, 425, 368 Discussion, Puttting a '66 motor into a '68 Car in Cadillac Engine Technical Discussion; Hoping for a little help. I have a really rough 66 SDV with a super solid drivetrain.I just recently purchased ...
  1. #1
    Jeremy6668 is offline Cadillac Owners Member
    Automobile(s): 1966 Sedan, 1968 Sedan, have had several others
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    Puttting a '66 motor into a '68 Car

    Hoping for a little help. I have a really rough 66 SDV with a super solid drivetrain.I just recently purchased a 68 SDV with a blown (hole in block) 472 but the car is Immaculate. I am a 24 year old college student and im just not in the position to rebuild the 472 at this time, but plan to keep it and do so in the future. A understand my 429 is a different build design and some modifications will be necessary, but is this still possible to do, or more importantly, a realistic idea to swap my healthy 429 into a 472 car. I've seen a lot of people do the opposite, but no one go about it quite like this.. any advice is appreciated! Thanks in advance!!!

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  3. #2
    BRUCE ROE is offline Cadillac Owners Fanatic
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    Re: Puttting a '66 motor into a '68 Car

    I believe both cars have a TH400 transmission, a big help. But the 429 and 472
    have different patterns, so you need to also transfer the transmission to match up.
    If the tail is a different length, it is possible to change out those parts.
    Bruce Roe

  4. #3
    drmenard is offline Cadillac Owners Connoisseur
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    Re: Puttting a '66 motor into a '68 Car

    Bruce , And did you forget to say the 66 is a switch pitch transmission? We all love that transmission.. Dave Menard

  5. #4
    Jeremy6668 is offline Cadillac Owners Member
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    Thread Starter

    Re: Puttting a '66 motor into a '68 Car

    Thanks for the heads-up about the tail shaft, I'll have to look into that. Im also concerned about not having motor/trans mounts that will work and if the crossmember could be different? Any ideas guys?? Thanks in advance!

  6. #5
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Puttting a '66 motor into a '68 Car

    I would see if there was any interest in that '66 engine. I think they are fairly hard to find and somebody might jump on it. If somebody wanted to buy it, then you could look for a 472 that will drop right in.

    I don't think your original plan would be that hard, even if you had to change frame mounts. They could be the same for all I know. I would try to hang onto that 66 trans and use it if possible. It doesn't cost that much to get a driveshaft cut or extended if needed.

  7. #6
    Jeremy6668 is offline Cadillac Owners Member
    Automobile(s): 1966 Sedan, 1968 Sedan, have had several others
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    Thread Starter

    Re: Puttting a '66 motor into a '68 Car

    Alright.i think I'm going to pursue it then to the best of my ability. Does anyone know if my front sump oil pan on my 429 will cause me any issues to drop it in?

  8. #7
    BRUCE ROE is offline Cadillac Owners Fanatic
    Automobile(s): Eldorado
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    Re: Puttting a '66 motor into a '68 Car

    Please don't talk about cutting driveshafts. If the tail section/shaft are different
    lengths, just swap them, the lessor evil in my opinion. Then everything regarding the
    trans is a direct bolt in. Note that 3 wire switch on the 429, connected to the trans, a
    68 doesn't have it. If a trans with a different length tail is put in a car, you also will
    be changing the position of the trans support, which could affect other things.

    Bruce Roe

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