429/425 ci ??
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  • 1 Post By cadillacmike68
  • 1 Post By Jaykeane
The Classic Cadillac Forum Discussion, 429/425 ci ?? in Past Cadillac Vehicle Discussion; Might sound like a silly question... But is it the same engine...?? Im assuming it is.... Cadillac literature refers to ...
  1. #1
    rksm is offline Cadillac Owners Member
    Automobile(s): 66 coupe Deville
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    429/425 ci ??

    Might sound like a silly question...
    But is it the same engine...?? Im assuming it is....
    Cadillac literature refers to the engine as 429 ci.
    When im searching for parts the option(for my 66 coupeDeville) displays as 425 ci.
    Ordered a distributor from msd. It doesn't match up with the stock one....shaft is different size...gear location doesn't match up. Any input is appreciated.

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  3. #2
    cadillacmike68's Avatar
    cadillacmike68 is offline Cadillac Owners Connoisseur
    Automobile(s): 68 DVC, 96 FLTWD Brg, 09 STS N* Platinum, 11 CTS Premium
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    Re: 429/425 ci ??

    The 429 was last used in 1967 models. The 425 is a smaller displacement version of the 472/500. The 472 was introduced in 1968 and the 500 (same bore, different crank for increased stroke) in 1970 on Eldorados only. In 1975, all Cadillacs had the 500, and in 1977 they all changed to the 425.

    There's Absolutely nothing in common between the 429 and 425.

    The exception is the Seville sedan which didn't exist in 1967-68. It was introduced in 1975 with a 350CI engine.
    77CDV likes this.

  4. #3
    rksm is offline Cadillac Owners Member
    Automobile(s): 66 coupe Deville
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    That makes sense. The bloody site had the 425 listed as the only option for 66 deville.
    But the engine didnt exist at the time!!
    I figured might b one of those anomalies where its a nominal difference between "official" specs and acutal.......
    Didnt evn occur to me that its a whole other engine.....

    Anyway....thx for the info

  5. #4
    FoxRodder's Avatar
    FoxRodder is offline Cadillac Owners Fanatic
    Automobile(s): 1968 Coupe Deville, 87 Mustang, 00 Mustang
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    Re: 429/425 ci ??

    On a side note, in the mustang circles I have never heard the first good thing about any msd distributors. The story I always read on the forums is that they won't work well and they end up putting back the stock one. I would return that and either run one of those electronic conversions under the stock cap or see if there is some kind of HEI retrofit available.

  6. #5
    sawyer is offline Cadillac Owners Member
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    I have MSD ignition box and distributor on my cadillac and chevelle both work great. Maybe the problem with the mustangs is ford is such a inferior product and putting a MSD box on a mustang is like buying a Rolex to to put on a timex band

  7. #6
    FoxRodder's Avatar
    FoxRodder is offline Cadillac Owners Fanatic
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    Re: 429/425 ci ??

    Sawyer, you have hurt my "feeling"

  8. #7
    Jaykeane is offline Cadillac Owners Member
    Automobile(s): 73 LD Ragtop
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    Re: 429/425 ci ??

    MSD distributors and their performance accessories are some of the best in the business..
    When i was a kid, i helped out at a repair shop.. old school place.. cluttered with 392 hemi parts, honest, great reputation, straight shooting mechanics.
    the shop owner was performing a pre-purchase inspection of an older used car for a good customer.
    "it's gonna need brakes, tires, U-joints.. it'll need a patch on the frame right there (points).. I can fix all that stuff.. it's a ford.. I can't fix that.."
    77CDV likes this.

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