How many horsepower does 472 engine has by current ratings?
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  1. #1
    Fleetwood70 is offline Cadillac Owners Fanatic
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    How many horsepower does 472 engine has by current ratings?

    I read that in 60's and 70's they rated engine horsepower differently.

    So for example the engine in 2000 Lincoln with 4.6L 275 hp and 275 lb·ft torque, would be more powerful than the 472ci in 70's Cadillac?

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  3. #2
    drmenard is offline Cadillac Owners Enthusiast
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    Re: How many horsepower does 472 engine has by current ratings?

    Don't be fooled just looking at the HP number... the torque number is a whole lot higher with a 472...The 472 has 500 or more foot pounds of torque...and have about 400 ft lbs at under 2000rpm....

  4. #3
    Fleetwood70 is offline Cadillac Owners Fanatic
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    Re: How many horsepower does 472 engine has by current ratings?

    Quote Originally Posted by drmenard View Post
    Don't be fooled just looking at the HP number... the torque number is a whole lot higher with a 472...The 472 has 500 or more foot pounds of torque...and have about 400 ft lbs at under 2000rpm....
    But how much of it ends up at the rear wheels? like 300 ft lbs max? that's what I want to know.

  5. #4
    BRUCE ROE is offline Cadillac Owners Fanatic
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    Re: How many horsepower does 472 engine has by current ratings?

    At low rpm, a torque converter can double that engine torque (that's what a torque converter does!). Then its multiplied by the trans & axle gears, maybe times 7 or 8. Bruce Roe

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    Fleetwood70 is offline Cadillac Owners Fanatic
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    Re: How many horsepower does 472 engine has by current ratings?

    So I guess no one ever had their 7.7l cadillac on dyno?

  7. #6
    drmenard is offline Cadillac Owners Enthusiast
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    Re: How many horsepower does 472 engine has by current ratings?

    I had my 472 on the dyno , I was having trouble at the time... but it did have 440 ft lbs at just under 2000 rpm at the rear wheels...I bet I have a bit more now..

  8. #7
    Fleetwood70 is offline Cadillac Owners Fanatic
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    Re: How many horsepower does 472 engine has by current ratings?

    Quote Originally Posted by drmenard View Post
    I had my 472 on the dyno , I was having trouble at the time... but it did have 440 ft lbs at just under 2000 rpm at the rear wheels...I bet I have a bit more now..
    By my rough estimates there weren't more than 250hp on higher rpm's right?

  9. #8
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: How many horsepower does 472 engine has by current ratings?

    Do you have any nice pics of that '70 Fleetwood Fleetwood70? I saw a nice black 69 Fleetwood sitting in a field last year. If I could just win the lottery.

  10. #9
    Fleetwood70 is offline Cadillac Owners Fanatic
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    Re: How many horsepower does 472 engine has by current ratings?

    Quote Originally Posted by cadillac_al View Post
    Do you have any nice pics of that '70 Fleetwood Fleetwood70? I saw a nice black 69 Fleetwood sitting in a field last year. If I could just win the lottery.
    See next post.

  11. #10
    Fleetwood70 is offline Cadillac Owners Fanatic
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    Re: How many horsepower does 472 engine has by current ratings?



  12. #11
    drmenard is offline Cadillac Owners Enthusiast
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    Re: How many horsepower does 472 engine has by current ratings?

    A completely stock motor will put out about 300hp..

  13. #12
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: How many horsepower does 472 engine has by current ratings?

    Nice looking car. I've always loved the 69&70 Devilles. If I were guessing at the power (which I am) I would have guessed close to 500 lbs torque and a little less than 300 hp at the wheels. In my younger days I used to power test all my cars up this steep hill near my house. Most of my cars that seemed pretty fast would run out of steam around 90 mph up that hill (stock GM 350's). My 70 Deville didn't seem like a powerhouse because it did everything at low rpm but the old 70 Deville pulled 110 mph up that hill. I was impressed. I always called that engine Maine Yankee after our nuclear power plant.

  14. #13
    Tiny Huge is offline Cadillac Owners Member
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    Re: How many horsepower does 472 engine has by current ratings?

    Just a small piece of info , The 472 and 500 are sought after for pick up swaps.the torque is good the "Roll on power" makes it well worth the extra effort .

  15. #14
    Fleetwood70 is offline Cadillac Owners Fanatic
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    Re: How many horsepower does 472 engine has by current ratings?

    Good to know that it still has about 300hp,
    What I don't fully understand is why 472ci in 1974 has only 205 hp, and 500ci has only 190hp and 360 lb-ft in 1976. Yeah I see it has lower compression ratio, some emission stuff, but, that sucks.

  16. #15
    DouglasJRizzo is offline Cadillac Owners Enthusiast
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    Re: How many horsepower does 472 engine has by current ratings?

    There are a few things to think about here. For one, back in the 60s and 70s many builders including GM rated horsepower as "gross" - that is before all the accessories and pipes et al were installed. Another concern is that horsepower was rated using fuels available at the time. A gallon of "high octane" from 1970 is WAY more volatile than a gallon of high octane in 2011. Your nose can tell you, the smell of fuel today is far less pungent than it was 40 years ago. It's not as volatile. The mtbe, toluene, etc are all radically different than from "back in the day."

    This is good and bad. The good is that you don't need huge, yawning, ports in the cylinder heads and massive valves the size of grapefruits to make power. The bad is that older engines that have these features, are frequently making LESS horsepower than their modern brethren and actually need to do many of the opposite things to make power.

    For instance, instead of a trash can sized four barrel carburetor, go for one considerably smaller, and you'll find that the engine response will improve. Also, a MUCH hotter spark is needed than the old cam/block or HEI systems could put out (although the HEI of '75 was a step in the right direction), and you'll find your fuel will burn better.

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