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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 500 CID swap: Building the '79 Cadillac that should have been in Past Cadillac Vehicle Discussion; It may well be the sweetest sound I've ever heard, this 500 now purring (growling?) thanks to worked over heads, ...
  1. #46
    bicentennialcadillac is offline Cadillac Owners Enthusiast
    Automobile(s): '76 Fleetwood Brougham, '79 Sedan deVille
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    It may well be the sweetest sound I've ever heard, this 500 now purring (growling?) thanks to worked over heads, cam, intake and carb. We had her going without the air filter assembly, and it's making me seriously consider an open design.

    Once the brakes are buttoned up, I'll have impressions from the road. Can't hardly wait.

  2. #47
    bicentennialcadillac is offline Cadillac Owners Enthusiast
    Automobile(s): '76 Fleetwood Brougham, '79 Sedan deVille
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Update: very troubling death rattle cured by strategically pounding the oil pan into submission. Yes, the 425 pan has to be modified to work with the 500's longer stroke.

    Snow and cold has greatly slowed progress, but the car is nearly ready for the road.

  3. #48
    outsider is offline Cadillac Owners Connoisseur
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    nice man. I know what you mean about the winter stuff...sucks. I had to put my 69 and 87 into storage

  4. #49
    csbuckn is offline Cadillac Owners Master
    Automobile(s): 84 Coupe w/500
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    That's weird, I didn't have to do anything to my 425 pan.

  5. #50
    bicentennialcadillac is offline Cadillac Owners Enthusiast
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Quote Originally Posted by csbuckn View Post
    That's weird, I didn't have to do anything to my 425 pan.
    It seems that many people don't have problems. In this case, it was making just enough contact to make noise.

  6. #51
    cosmo is offline Cadillac Owners Member
    Automobile(s): 1976 Sedan deVille
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Last time I swapped a 425 oil pan onto a 472, I had to shorten the pickup support owing to the longer caps on the 472. Seems Cadillac saved some weight by making the block even more thinwall, and even making the main caps smaller overall.

    And I had no problems with clearance, but, again, it was a 472.

    Oh, yeah, great build, and, true, an easy way to get a LOT more torque!

    Cosmo

  7. #52
    pompste is offline Cadillac Owners Connoisseur
    Automobile(s): 1995 SEDAN DEVILLE-4.9 & 1978 SEDAN DEVILLE-425
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Quote Originally Posted by bicentennialcadillac View Post
    This is the intended recipient. '79 Sedan deVille, leather, cruise and nothing else.





    The car had taken a hit to the passenger-side quarter when I bought it out of Union, SC with 44,000 original miles. One rust-free quarter and full respray later, and I thought I had myself a steal - until the 425 developed a knock that would eject ashes from the dash-mounted tray.

    Some may wonder why I would put so much effort into such a plain model. The simplicity is what I love about this car - the white color and clean top really stand out IMHO.
    She`s a real beauty! A rare one with no vinyl top!

  8. #53
    sinatra caddy is offline Cadillac Owners Member
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    ive enjoyed reading this thread. well done sir! great swap! what exhaust are you going to be running?

  9. #54
    bicentennialcadillac is offline Cadillac Owners Enthusiast
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Thanks for the compliments.

    I plan to run dual Walker 22317 Quiet-Flows, no cats.

  10. #55
    tylersloan is offline Cadillac Owners Member
    Automobile(s): 85 Fleetwood Brougham
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    NICE i own a 85 and have always wanted to do this to mine keep up the good work.

  11. #56
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    that will be a true sleeper. no one expects a 500 ci motor until the hood of a plain jane caddy. if I just saw that car coming down the road, I'd probably mistake it for an olds (roof and doors look very similar to an olds 88 of the era)

  12. #57
    brougham_geezer is offline Cadillac Owners Enthusiast
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Fantastic! Will the exhaust be true duals? If so, are you notching the crossmember or routing both through the passenger-side hump, and back over? Subtle chrome turn-downs look nice... but I am thinking this car should have the exhaust exiting in the factory style, with the tailpipes barely visble and unfinished. And put a rear stabilizer bar on that beast!

  13. #58
    bicentennialcadillac is offline Cadillac Owners Enthusiast
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    True duals, routed through the passenger-side hump. You and I are of like minds - I will demand as subtle an installation as possible, as in "how would Cadillac have done this in 1979?"

    I have a Fleetwood bar on it at present.

  14. #59
    drmenard is offline Cadillac Owners Enthusiast
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    If you want to make your installation of the dual exhaust eazier... get a crossmember of a 94-96 fleetwood or brougham.... They used the same frame from 77-96.... the only thing I had to do was drill two bolt holes in the frame... one side had the holes and the passanger side I had to drill... I'm guessing you got a 2.28 rear end in that car... I suggest you drive it with those gears before you think you have to change it..

  15. #60
    tylersloan is offline Cadillac Owners Member
    Automobile(s): 85 Fleetwood Brougham
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    was this a straight bolt in swap for you ? im doing the same to my 85 and was trying to find out if its just a bolt in swap.
    im using a TH400 with my 500 and after i seen yours i may have to get rid of my top also .
    did you use factory 500 motor mounts or was it a mix and match deal ?
    did you have to drill new holes to mount the motor in the frame ?
    sorry for all the questions i just want to get the facts before i start on mine and from what i understand we have the same exact frame thank you for your help
    cant wait to see it done car looks really nice

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