The ACTUAL Horsepower Of Classic Muscle Car Engines

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    Author Topic: The ACTUAL Horsepower Of Classic Muscle Car Engines  (Read 6033 times)

    Offline Fleet 500

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    The ACTUAL Horsepower Of Classic Muscle Car Engines
    « on: April 16, 2005 - 11:24:33 PM »
    I'm sure everyone here knows that many '60s/early '70 muscle car engines were (on purpose) underrated. For instance, the "275-hp" 340 Mopar engine really makes more like 320 hp.
    Here is a very good article in a muscle car magazine by Roger Huntington.
    Page 4 has the chart of the actual horsepower, but I'll list it here, too (Mopars only):

    Engine............ Rated HP.......... Rated Torque....... Actual HP

    340-4 bbl..........275@5000 rpm.  340@3200 rpm...  320@5600
    440-4 bbl..........375@4600.......  480@3200.........  410@5400
    440-6 bbl..........390@4700.......  490@3200.........  430@5600
    426-Hemi..........425@5000.......  490@4000.........  470@6000

    For some reason, they did not list the 340-6 bbl; I would guess it really made 335-340 hp.

    Here is page one of 6:

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    Offline Fleet 500

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    Re: The ACTUAL Horsepower Of Classic Muscle Car Engines
    « Reply #1 on: April 16, 2005 - 11:29:09 PM »
    Page 2:

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    Offline Carlwalski

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    Re: The ACTUAL Horsepower Of Classic Muscle Car Engines
    « Reply #2 on: April 16, 2005 - 11:31:47 PM »
    Soooooo, because I'm taking my stock 375hp into my overall after headers and the other little extra hp gainers to all add up another 25hp (estimated) I'm saying 400hp, I could "now" say 435hp!?!?!?  :dontknow: :grinyes: :grinno: :grinyes: I know the only true way is to get a dyno but this is just for overall hp the higest sound hp numbers one can give, so-to-speak.  ;D 410hp and Torque? 505-510lbs-ft?  ;)
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    1970 Dodge Challenger R/T
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    Offline Fleet 500

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    Re: The ACTUAL Horsepower Of Classic Muscle Car Engines
    « Reply #3 on: April 16, 2005 - 11:36:16 PM »
    Quote from: NZ 440RT on April 16, 2005 - 11:31:47 PM
    Soooooo, because I'm taking my stock 375hp into my overall after headers and the other little extra hp gainers to all add up another 25hp (estimated) I'm saying 400hp, I could "now" say 435hp!?!?!?  :dontknow: :grinyes: :grinno: :grinyes: I know the only true way is to get a dyno but this is just for overall hp the higest sound hp numbers one can give, so-to-speak.  ;D 410hp and Torque? 505-510lbs-ft?  ;)
    One of the regulars at the weekly car gathering has a '72 Duster with a built 360. He says it dynos at 420 hp and 450 lbs/ft torque. So your engine making the hp you quoted seems very likely!
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    Offline Carlwalski

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    Re: The ACTUAL Horsepower Of Classic Muscle Car Engines
    « Reply #4 on: April 16, 2005 - 11:38:42 PM »
    Yeah, kind of sounds right to me if the 410hp figures are true which I would presume so.  :grinyes: :thumbs: :worship:

    Cheers bud  ;)
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    1970 Dodge Challenger R/T
    White, License Plate, 0A-5599
    540ci Aluminium Hemi, F.A.S.T EFI
    TF-727 Gear Vendor OD, Dana 60

    Offline Fleet 500

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    Re: The ACTUAL Horsepower Of Classic Muscle Car Engines
    « Reply #5 on: April 16, 2005 - 11:42:07 PM »
    Page 3:

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    Offline Fleet 500

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    Re: The ACTUAL Horsepower Of Classic Muscle Car Engines
    « Reply #6 on: April 16, 2005 - 11:49:29 PM »
    Page 4. This is the page with the chart.

    [attachment deleted by admin]
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    Offline Fleet 500

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    Re: The ACTUAL Horsepower Of Classic Muscle Car Engines
    « Reply #7 on: April 16, 2005 - 11:56:24 PM »
    Page 5...

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    Offline Fleet 500

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    Re: The ACTUAL Horsepower Of Classic Muscle Car Engines
    « Reply #8 on: April 17, 2005 - 12:01:22 AM »
    Last page... page 6.

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    Offline MoparMan440

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    Re: The ACTUAL Horsepower Of Classic Muscle Car Engines
    « Reply #9 on: April 18, 2005 - 12:08:26 AM »
    My T/A will be on the dyno this week Thursday so I'll let you know what the final numbers are after being tuned. The motor is basically stock but it does have headders, punched 10 over and has a real mild cam. I'll let you know Thursday night !  :thumbs:
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    Offline Fleet 500

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    Re: The ACTUAL Horsepower Of Classic Muscle Car Engines
    « Reply #10 on: April 18, 2005 - 12:24:18 AM »
    Okay, it would be good to know what the figure is. I'm sure you would agree that the 290 hp rating is a joke! (Much underrated.)
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    Offline MoparMan440

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    Re: The ACTUAL Horsepower Of Classic Muscle Car Engines
    « Reply #11 on: April 18, 2005 - 12:46:18 AM »
    I sure hope it is or else the joke will be on me !  :banghead: I hope it's much higher but I'll find out in a few days. Of course this is an on car dyno so we'll need to figure it out by power to the rear wheels.
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    Offline Fleet 500

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    Re: The ACTUAL Horsepower Of Classic Muscle Car Engines
    « Reply #12 on: April 18, 2005 - 03:23:46 PM »
    True, rear wheel horsepower is of course less than hp taken before the rear wheels.
    If the true gross hp is about 340, and net is about 290-300, I would guess the rear wheel hp is somewhere around 230-260. That's just a guess though.
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