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  1. #1
    Registered
    My Boats:
    1999 Spectre 36
    Join Date
    Oct 2000
    Location
    Fells Point MD
    Posts
    532

    HP 500 Carb Upgrade to 650HP

    Who has a "kit" with bolt on

    heads
    intake
    carb
    ignition

    I would like to increase my 500s to 650-700 HP.

    Can this be done with a pump gas bolt on of the above parts?
    I would like to leave the bottom end alone.

    If I need a Whipple, do I need to do head, carb and ignition upgrades? I would think the MSD would be required to address the igher revs. I do not think the heads come from merc with inconel exhaust valves.

    I understand Tyler Crocket has a kit that will run to 600 Hp.

    Any idea of the cost to do this?

    Thanks
    Shawn

  2. #2
    Registered Tinkerer's Avatar
    My Boats:
    1992--34 SCARAB 2001 26 Daytona
    Join Date
    Jan 2002
    Location
    ALTO, MI
    Posts
    3,010
    All of the above plus header style exhaust and cam.
    JIM V. can set you up. He can easily get 650 HP out of a 502.

  3. #3
    Registered totalmp's Avatar
    Join Date
    Mar 2002
    Location
    Louisiana
    Posts
    503
    We offer a complete kit to make your 500 HP a 650 HP, 8500.00/engine includes complete rebuild w/ all new top shelf parts, Aluminum heads, Forged pistons, roller rockers, Manley Valves, Hydraulic Roller camshaft, Custom Painted w/ Custom Valve covers and Billet Flame Arrestor.

    We also offer other packages that are each custom tailored to your engines. Feel free to give me a call to determine which will be best for you.

    Thanks,

    Steve
    504-415-6681

  4. #4
    Charter Member Charter Member 1Boatnut's Avatar
    My Boats:
    Titanic & Duct Tape
    Join Date
    Mar 2001
    Location
    New Lenox IL
    Posts
    334
    Originally posted by Tinkerboater
    All of the above plus header style exhaust and cam.
    JIM V. can set you up. He can easily get 650 HP out of a 502.

    650 Hp from a 502 ? Naturally aspirated ?
    Seen The Light

  5. #5
    Dennis Moore
    Guest

    Not very reliable though...

    I think that you should consider the reliability of such an engine. It will need a camshaft with very fast opening and closing lobes with very high lift causing valve spring, lifter, rocker arm and valve seat wear. Be prepared to rebuild the valvetrain every 40 or 50 hours of operation. Compression ratios need to be elevated for such powerful camshafts or the engine will be a real dog at low speeds with very poor idle characteristics.


    You better start thinking about an engine with more than 502 cubic inches so the horsepower will come from displacement and not wild valve timing and high rpm.

    Some people say a reliable and smooth running engine can make that kind of horsepower on pump gas but I haven't seen one yet!
    If it were easy and reliable we would all have 650-700 horsepower NA engines in our boats.

    Sincerely
    Dennis Moore

  6. #6
    Official OSO boat whore Charter Member
    My Boats:
    8' row boat
    Join Date
    Oct 2000
    Location
    Mequon, WI
    Posts
    6,139
    I'm thinking that you will need more than just a kit. The entire engine will need to be gone through. The only exception would be if you added a 8:71. Even then, you'll at least need to change the pistons, so a tear down is still in order. I'd have to really question the reliability of a 502 making 700hp N/A.

  7. #7
    Registered Tinkerer's Avatar
    My Boats:
    1992--34 SCARAB 2001 26 Daytona
    Join Date
    Jan 2002
    Location
    ALTO, MI
    Posts
    3,010
    650 HP out of a 502 is not pushing the envelope. The engine will run fine and stay togeather. It will have to run on prem. gas.


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