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Thread: 550 Horsepower

  1. #1
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    550 Horsepower

    Does this build up have the "good stuff" and is 550 ponies about right?

    454cid 550hp Dart Big M Iron block, 9 1/2 to 1 compression, Bravo drive w/shower
    Crane hyd roller Cam w/roller lifters & gold roller rockers, Hardin SS sea pump
    Manley SS intake valves & Inconel exhaust valves -10hrs on engine fresh water only
    Imco exhaust manifolds with SS risers, Cyclone SS mufflers tips, Halon fire system
    Holly 830 carb, MSD ign system w/rev limiter & distrib, dual batteries w/switch
    1972 16 OB - C16B-63 - "Surface Tension" Resto Project
    1974 16 OB - DMR16106017-B - "The Mule"

  2. #2
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    Cam specs? Heads?
    Cheers,
    Pismo
    1996 22 Classic
    Red with Stainless Windshield
    Stock Gen VI 502 Magnum MPI-415hp
    Stock Bravo I
    25" Mirage Plus
    74.5mph best @ 5050rpm GPS (Speedo said 80)
    27" Labbed Mirage Plus
    75.5mph best @ 4800rpm GPS (Speedo said 82)

  3. #3
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    That may be a little high for a 454 running at the engine speeds we need.
    George Carter
    Central Florida
    gcarter763@aol.com
    http://kineticocentralfl.com/


    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

  4. #4
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    the first one to make 550HP with a 454 we will call "Hot Sauce".


  5. #5
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    Need to turn high rpm to make 550HP

    I know a couple of guys that have built marine 454s that dyno'd just over 500 @ 5600. Need to build a 454 to spin over 6000rpm or have a blower on top to get 550.
    Thank you, Patrick
    1994 18' Classic 350Mag Alpha

    Previously owned Donzis -
    1996 22' Classic, 502Mag Bravo
    1987 20' Minx, 350Mag Alpha
    1975 18' Classic, 350Chevy Volvo 280

  6. #6
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    i thinks it possible. you are just having to be "that guy" to do it.


  7. #7
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    550 w a 454 is easy. Go buy some good heads.
    DUNESMAN

  8. #8
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    Quote Originally Posted by pipnit View Post
    550 w a 454 is easy. Go buy some good heads.

    lmao!

    everybody is doing it. everything is easy on the internet. just type, its so, because i say so, bam!

    how many times you done it? who's done it? easy, ya!

  9. #9
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    It might be hard to build one in the the back hills
    of Nirvana, but, in the big city with a good engine
    builder, its not that hard. Cam, compression, heads,
    and manifold.. Try it you'll like it ..Ed

  10. #10
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    Quote Originally Posted by Donzi_Dude View Post
    lmao!

    everybody is doing it. everything is easy on the internet. just type, its so, because i say so, bam!

    how many times you done it? who's done it? easy, ya!

    You make is sound like it's impossible or that I'm hiding behind a screen or keyboard. Neither of this is the case.
    It's not hard at all to do, just takes a little coin and some smart thinking.
    I have a '76 2+3 with a big old honking TRS drive (re: inefficient) with a small block that runs 75mph on a gps on 87 octane. She runs like a top, no detonation, great response and a lot of fun!

    To the original poster, you might want to call Bob Madera at Marine Kinetics. He'll give you good advice and could design a 454 which will get you to 550hp easily.
    DUNESMAN

  11. #11
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    Quote Originally Posted by pipnit View Post
    You make is sound like it's impossible or that I'm hiding behind a screen or keyboard. Neither of this is the case.
    It's not hard at all to do, just takes a little coin and some smart thinking.
    I have a '76 2+3 with a big old honking TRS drive (re: inefficient) with a small block that runs 75mph on a gps on 87 octane. She runs like a top, no detonation, great response and a lot of fun!

    To the original poster, you might want to call Bob Madera at Marine Kinetics. He'll give you good advice and could design a 454 which will get you to 550hp easily.

    no, i just think you know little to nothing about making horsepower and yet still insist it an easy feat yet offer not one example.

    your advice, call a guru.

    /pass

  12. #12
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    Yeah, damn straight I'd call a Guru. I never claimed to be an engine builder did I? My point is 550 out of a 454 isn't that difficult. I have seen MANY 454's with that much power and a lot more. If you have the coin, have someone build it for you.

    Maybe because you couldn't do it you think nobody can? It appears you tried to piece meal a 500+hp without having a comprehensive plan and failed? My advice of calling Bob is actually very sage. If might cost you some $ at the front end but when it comes time for delivery, you'll get what you planned for. In the end, it'll be a LOT cheaper and less painful than dicking around with it, trial and error style.

    my short list would be a callies, lightweight forged stroker crank
    some afr heads
    good exhaust
    victor intake
    pro systems carb

    if you can afford the stuff above, you can afford buying a cam and some advice from RMbuilder...


    http://www.donzi.net/forums/showthre...330&highlight=


    http://www.donzi.net/forums/showthre...nzi&highlight=
    DUNESMAN

  13. #13
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    Quote Originally Posted by pipnit View Post
    My point is 550 out of a 454 isn't that difficult. I have seen MANY 454's with that much power and a lot more.


    my point is your point is wrong. how do you know what i have or have not done? you dont!




    still waiting on all the examples of folks easily making 550 that you have claimed again and again. maybe your troll game is not as good as you thought?

  14. #14
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    sloth-yawn-cute.gif

    I guess all of these guys are chumps for suggesting to call RMbuilder as well
    http://www.offshoreonly.com/forums/d...am-advice.html
    DUNESMAN

  15. #15
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    Greg, 550hp sounds a little optimistic for 9.6:1 compression. I have well built 454's in my magnum that are 550 to 575hp and that's with 4-5lbs of boost. Without the sc's probably around 450hp. 500 hp should be doable without loosing reliability but beyond that you are trying to 10 10ths out of a marine engine which is not for me. I would rather start with 502ci if 550 hp is your goal. - Marshall
    1978 Magnum Starfire "MAYHEM"
    1994 Donzi 22 Classic 540/Blackhawk - Sold
    1982 Midnight Express 32 SS

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