1979 deville
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500, 472, 425, 368 Discussion, 1979 deville in Cadillac Engine Technical Discussion; hey guys. theres a 79 deville for sale near me and i know it has a 425ci engine but what ...
  1. #1
    trife86 is offline Cadillac Owners Member
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    1979 deville

    hey guys. theres a 79 deville for sale near me and i know it has a 425ci engine but what kind of power does this thing make and what is the average mpg can i expect from it?
    any info would help

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  3. #2
    davesdeville's Avatar
    davesdeville is offline Banned
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    Re: 1979 deville

    I get about 9mpg city (lead foot) with my 425 in a slightly heavier car. It's really not too fast, but it's a good candidate if you want to build up a 500/472 and still have a running car.

  4. #3
    trife86 is offline Cadillac Owners Member
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    Re: 1979 deville

    hehe well what kinda of power is it rated at? it would be my 2nd car to get going my 90 towncar has seen better days

  5. #4
    Angela Desmond is offline Cadillac Owners Fanatic
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    Re: 1979 deville

    Allante North and I are both doing 425 project engines at this time. With the parts I'm using and my modifications, "Desktop Dyno" projects about 440HP and 480 ft.lbs. of torque. If I'm not mistaken they were originally rated at about 150 net HP. My husband used to get about 14mpg on the highway commuting to work. There's plenty that can be done to them, but for really monster torque, it's hard to beat the 500CI. If you're going to build it up, you've come to the right forum. You should be able to avoid any of the pitfalls we've discovered in our attemps at power.

  6. #5
    caddydaddy's Avatar
    caddydaddy is offline Cadillac Owners Connoisseur
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    Re: 1979 deville

    The 4 barrell 425 made 180 HP at 4,000 RPM and 320 lbs-ft of torque at 2,000 RPM's.

  7. #6
    78425sedvil is offline Cadillac Owners Member
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    Re: 1979 deville

    Quote Originally Posted by trife86
    hey guys. theres a 79 deville for sale near me and i know it has a 425ci engine but what kind of power does this thing make and what is the average mpg can i expect from it?
    any info would help
    mine is stock with a tired motor with 2 cylinders constantly fouled and it puts out 180 hp at 4000 and 380 lbs at 2500

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