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  1. #1
    It's all my fault VIP Member axapowell's Avatar
    My Boats:
    Blinged Up 353 Fastech w/600's and XR's, Boxes and Sportmaster Shorties
    Join Date
    Nov 2001
    Location
    Alexandria Bay, NY 1000 Islands
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    2,399

    Would like to make 600hp out of a HP500

    Need some help from anyone who has already done this (I don't want to re-invent the wheel).

    I have 2 1999 HP500's, carbed, and want to upgrade to 600 horsepower. I wound rather not go to blowers and am hoping to just upgrade the heads and cam. Anything more then about 620hp will require a drive upgrade, so I'm not interested in going any higher.

    I have the Merc HP exhaust manifolds and Gil risers, so I would assume that exhaust is not an issue.

    Dart intake and 800cfm (or 850) Holley's. Plenty of CFM and flow on the intake as well to handle the additional horsepower.

    I have access to a dyno and will check the hp and torque curve on the current setup and build from there. Someone has to have already done this. If I have to, I will upgade the distributor and change the factor rev limiter so I can pull a few more rpm's but top out at around 5800.

    I want to continue to run pump gas (89 octane) and keep the reliability factor. Does this sound doable? Thanks in advance for the help.

    Dave

  2. #2
    S.O.B (single O/B) now Platinum Member t500hps's Avatar
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    Sep 2004
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    Richmond VA
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    7,669

    Re: Would like to make 600hp out of a HP500

    "excursion" did this to his carbed 500 this past winter. Ended up close to 600hp. He can give you more info.

  3. #3
    Registered
    My Boats:
    fuel injection, superchargers
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    Re: Would like to make 600hp out of a HP500

    Send your steel heads to JimV or use alumn AFR315cc and Crane 731 cam will get you real close.

  4. #4
    Registered
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    Nov 2004
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    445

    Re: Would like to make 600hp out of a HP500

    Your exhaust is an issue....guaranteed.

  5. #5
    Banned
    My Boats:
    '97 Rinker Captiva
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    Jan 2005
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    Tri-Cities, TN
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    Re: Would like to make 600hp out of a HP500

    HP is a calculated number based on torque x RPM. RPM is not a friend of I/O boats. I would keep your top half and buy cranks rods and pistons and build a set of 540's. Nothing like an extra .250" worth of arm to ad gobs of torque to an engine. The 188 heads you have are fine for 540 inches.

  6. #6
    Registered Boatally Insane's Avatar
    My Boats:
    79 Excalibur 24
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    Nov 2004
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    Lago Vista TX
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    Re: Would like to make 600hp out of a HP500

    I built up a 509 this past spring for my boat...

    On the dyno run I posted it made 595 hp at 5400 rpm

    On another pull it made 599.5 hp at 5600 rpm...

    This is with "dyno" headers turning the water circulating pump...

    For exhaust I ended up using Keith Eickert's but I don't think reversion would be an issue with what you have...

    It has run GREAT all summer long...


    502 mag build

    502 block bored .030 over to 4.5"
    JE pistons, wrist pins, and rings.

    Stock crank turned .10 .10
    stock connecting rods resized with ARP bolts.
    Balanced Rotating assembly

    088 casting GM iron heads custom ported at NVR racing
    with Manley 2.25 stainless intake and 1.9 inconel exhaust valves.
    118 cc chambers
    8.9:1 compression
    ARP head bolts.
    Gasket Specialties head gaskets

    Custom Ground Cam Motion cam (spec'd by rmbuilder)
    Intake .594 lift 228 degrees duration at .050
    Exhaust .600 lift 232.7 degrees duration at .050
    112.2 degrees lobe separation
    Morel hydraulic roller lifters
    Crane gold roller rockers

    Edelbrock Victor Jr intake port matched to heads
    Demon Mighty Marine 850 carb with #80 primary and #88 secondary jets. The only adjustment required on the carb AT ALL was idle speed!!! The jetting was right on the money!!

    Modified Mercruiser magnetic trigger distributor
    Crane Ignition box using their #6 advance curve with 14 degrees initial timing advancing to 34 degrees by 2500 RPM
    Autolite AR135 spark plugs
    Mercruiser plug wires .


    Doug
    Last edited by Boatally Insane; 10-10-2005 at 03:23 PM.

  7. #7
    Registered Back4More's Avatar
    My Boats:
    42 No More...410 SeaRay
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    Feb 2002
    Location
    Lake Michigan
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    Re: Would like to make 600hp out of a HP500

    Cam, and heads with 9.8 to 10:1 CR...55-5600rpm
    Dart Pro1 alum heads if your going to keep those Gils, and for more power a set of the Pro1 CNC'd and some CMI's
    Isky Hyd. roller cam...ground @114CL
    http://www.iskycams.com/engine_templ...7&engine_id=20
    Grind No.
    RR-284/294 HYDRAULIC ROLLER
    Last edited by Back4More; 10-10-2005 at 03:43 PM.

  8. #8
    Banned
    My Boats:
    '97 Rinker Captiva
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    Re: Would like to make 600hp out of a HP500

    Bill,
    Kip, Cam Motion, does not give out std cam cards. Cam Motion runs Cam Doctor on each cam which prints out the exact spec's at which the cam is ground.

    Chris

  9. #9
    It's all my fault VIP Member axapowell's Avatar
    My Boats:
    Blinged Up 353 Fastech w/600's and XR's, Boxes and Sportmaster Shorties
    Join Date
    Nov 2001
    Location
    Alexandria Bay, NY 1000 Islands
    Posts
    2,399

    Re: Would like to make 600hp out of a HP500

    Quote Originally Posted by Boatally Insane
    I built up a 509 this past spring for my boat...

    On the dyno run I posted it made 595 hp at 5400 rpm

    On another pull it made 599.5 hp at 5600 rpm...

    This is with "dyno" headers turning the water circulating pump...

    For exhaust I ended up using Keith Eickert's but I don't think reversion would be an issue with what you have...

    It has run GREAT all summer long...


    Doug
    Ok...Alot to process. Sounds like a great combo, but don't I already have most of that in my HP500?

    Victor Jr= Dart intake+porting
    Demon 850 cfm Carb= Holley 850

    Crane cam in HP500 Intake .576 lift 222 degrees duration at .050
    Exhaust .598 lift 230degrees duration at .050
    110 center
    Your grind: Intake .594 lift 228 degrees duration at .050
    Exhaust .600 lift 232.7 degrees duration at .050
    112.2 center

    JE pistons, 118 cc chamber, 2.10 intake valves, 1.88 exhaust, crane gold roller rockers.

    So, if I got this right, I can go to a GM Signature Series Rect. Port Aluminum head (GM PN#12363400) with the bigger intake valve (2.25/1.88E) change the exhaust valves to Manley Inconel and a bigger cam similar to yours, keep the stock bore(if I can) port my intake manifold to match the gasket and heads, change the module in the distributor and add a rev limiter with a box(MSD or such) that should do it? A few less cubes, all good bottom end, and balance the rotating assembly...This should be around 600 hp at 5600-5800 rpms.

    Hmmmm....has anyone else had a winning combo?

    Thanks so far for the responses!! BIG HELP

    Dave

  10. #10
    It's all my fault VIP Member axapowell's Avatar
    My Boats:
    Blinged Up 353 Fastech w/600's and XR's, Boxes and Sportmaster Shorties
    Join Date
    Nov 2001
    Location
    Alexandria Bay, NY 1000 Islands
    Posts
    2,399

    Re: Would like to make 600hp out of a HP500

    Here is the specs on the heads:

    12363400
    Signature Series Rectangular Port Aluminum
    Cylinder Head Assembly
    Rectangular port head made from 356-T6 aluminum alloy for
    1965-2000 Mark IV and Gen V & VI 396, 427, 454, and 502 bigblock
    engines with compression ratios below 12.5:1. High
    velocity 315-cc long intake runners and 300-cc short runners
    enhance mid-range torque and throttle response. Exhaust
    runner volume is 110 cc. Semi-open 118-cc combustion
    chamber design provides very streetable compression ratios.
    Rocker studs and exhaust bolt holes are heli-coiled for
    strength. The 9/16-inch deck surface provides maximum
    strength and greater head gasket sealing. Intake and exhaust
    ports are in stock locations. Head assembly includes 2.25-
    inch stainless steel intake valves P/N 12366987, 1.88-inch
    stainless exhaust valves P/N 12366988, 1.55-inch valve
    springs P/N 12462970, valve spring retainers P/N 12366990,
    valve spring shims P/N 3875916, valve locks P/N 12366992,
    and oil seals P/N 12495690. The above part numbers can be
    used for service replacement parts. Heads require cylinder
    bolt kit P/N 12367779.
    Attached Files Attached Files
    Last edited by axapowell; 10-10-2005 at 06:55 PM. Reason: added


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