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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; Thanks man. It was a straight swap for me using the 425 mounts. No new holes. However, this may be ...
  1. #61
    bicentennialcadillac is offline Cadillac Owners Enthusiast
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Thanks man.

    It was a straight swap for me using the 425 mounts. No new holes.

    However, this may be different for a 4100 car.

  2. #62
    bicentennialcadillac is offline Cadillac Owners Enthusiast
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    ....

  3. #63
    tylersloan is offline Cadillac Owners Member
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    could i see some photos of the engine bay ? also im using the side shot of your car as my back ground on my desk top just amazing !

  4. #64
    bicentennialcadillac is offline Cadillac Owners Enthusiast
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    I've been daily driving the hell out of the car over the last couple days. Even this mild 500 is a fantastic improvement, worth every penny and drop of sweat. Torque is a hell of a drug. An unexpected benefit: the extra 100 lbs. of heft out front really improves the car's feel.

    I will get the MTS MSD distributor in there in a couple days, and then a dual exhaust shortly thereafter. Pics soon.

  5. #65
    Stingroo's Avatar
    Stingroo is online now Wagon/Audio Enthusiast
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    Re: 500 CID swap: Building the '79 Cadillac that should have been


  6. #66
    csbuckn is online now Cadillac Owners Master
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Let me know how the dizzy works, thats on my list also.

  7. #67
    lacville78 is offline Cadillac Owners Fanatic
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    I got a 500 and a 78 Sedan
    I'm thinking about doing the same thing.

    I have a question

    From what I understand The swap is a bolt in, other than the pan and exhaust manifold clearance issue

    The exhaust I understand to cut the passenger side control bolt a bit to make the manifold fit.

    But the oil pan I'm having problems understand
    Do you just beat the 425 pan with a hammer to help clear the 500 crank
    Does that cause warping?? How big of a dent do you have to make??
    Also you use the 425 pick up tube as well, I think

    I just worry about that pan because I don't plan on running the engine on the stand.
    I want to make sure everything clears before I bolt it all up

    Oops.

    1 more

    Accessories
    The 500 I got had the compressor robbed
    Could I use the rest of the 500 accessories
    With the A/C compressor and brackets off of my 425


    Thanks man and nice work!!!!!!!!


    How about a vid of you taking her for a cruise????
    That would be sweet!

  8. #68
    Powar is offline Cadillac Owners Member
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Awesome project. I'd love to see some more pics of the finished product... and maybe a soundclip when you get that new exhaust!

  9. #69
    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 lacville78 View Post
    Do you just beat the 425 pan with a hammer to help clear the 500 crank
    Does that cause warping?? How big of a dent do you have to make??
    Also you use the 425 pick up tube as well, I think

    I just worry about that pan because I don't plan on running the engine on the stand.
    I want to make sure everything clears before I bolt it all up
    It's really a guessing game. Because of apparent manufacturing differences, some 425 pans fit fine, others need the "mod." Marty at MTS runs his on a stand, then inspects the pan for scarring from the rotating assembly. The scarring gives you a very precise markup for where to strike the pan. Mine needed very little in the way of tapping with a ball-peen hammer.

    Quote Originally Posted by lacville78 View Post
    The 500 I got had the compressor robbed
    Could I use the rest of the 500 accessories
    With the A/C compressor and brackets off of my 425
    I'm using all my 425 accessories. The 425 valve covers allow you to mount the cruise control in the factory location. I did use the 500 fan.

    Quote Originally Posted by lacville78 View Post
    How about a vid of you taking her for a cruise????
    That would be sweet!
    Quote Originally Posted by Powar View Post
    Awesome project. I'd love to see some more pics of the finished product... and maybe a soundclip when you get that new exhaust!
    Thanks for the compliments. I will get some pics and vid up once the dizzy and exhaust are in.

  10. #70
    csbuckn is online now Cadillac Owners Master
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    I didnt have to do anything to my 425 pan but you can always turn the motor while its on the stand to make sure it doesnt hit.

  11. #71
    brougham_geezer is offline Cadillac Owners Enthusiast
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Alright, Mr. Inspiration.

    I've decided I'm going to do the 500 swap into my '80 CDV, because of you. Just bought a '76 CDV parts car.

    You happy now?

    Also, would appreciate some more in-car motor pics, as it sits now, and how about this NOS rad? Is it a 4 core GM of some sort, or just a standard '79 425 unit?

  12. #72
    bicentennialcadillac is offline Cadillac Owners Enthusiast
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Excellent! I look forward to the 1980 Cadillac that should have been. The difference between 425 and 500 is great - I would expect the improvement from 368 to 500 to be downright startling, especially given the diet the B/D bodies went on for 1980.

    The radiator is a 4 core GM that had adaptors allowing for fitment to any of the '77-'96 B/D bodies. I promise to get some pics up soon.

    We're averaging 8 mpg over the first 300 miles of (mostly stop-and-go) daily driving, running Valvoline VR1 20W-50. She loves 91 octane - an ugly bout of dieseling on 87 proved that. I expect mileage and performance to improve with the dizzy and exhaust mods.

  13. #73
    pompste is offline Cadillac Owners Connoisseur
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Does anyone know the "weight" difference between the 500 and the 425?

  14. #74
    pompste is offline Cadillac Owners Connoisseur
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    Re: 500 CID swap: Building the '79 Cadillac that should have been

    Quote Originally Posted by bicentennialcadillac View Post
    Excellent! I look forward to the 1980 Cadillac that should have been. The difference between 425 and 500 is great - I would expect the improvement from 368 to 500 to be downright startling, especially given the diet the B/D bodies went on for 1980.

    The radiator is a 4 core GM that had adaptors allowing for fitment to any of the '77-'96 B/D bodies. I promise to get some pics up soon.

    We're averaging 8 mpg over the first 300 miles of (mostly stop-and-go) daily driving, running Valvoline VR1 20W-50. She loves 91 octane - an ugly bout of dieseling on 87 proved that. I expect mileage and performance to improve with the dizzy and exhaust mods.
    Wow--8 mpg--that`s a thirsty engine.Probably will get better highway mpg.What were the 500 engines rated at for mpg back in the day?

  15. #75
    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 pompste View Post
    Does anyone know the "weight" difference between the 500 and the 425?
    I've been told it's in the neighborhood of 100 lbs.

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