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Thread: what cam for 500HP out of a 330

  1. #1
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    what cam for 500HP out of a 330

    mercruiser that is.


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    once you let us know what heads, pistons, intake, carb, comp ratio, and rpm expectation you want, then maybe you can be assisted..

    cam choice is the LAST thing to choose

    otherwise your into a catalog masturbation of trial and error, and never getting there
    Charter Member - WAFNC, SBBR, KWOSG
    1955 Perfect Mate
    1986 Hornet III, 502-415 TRS

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    Quote Originally Posted by BUIZILLA View Post
    once you let us know what heads, pistons, intake, carb, comp ratio, and rpm expectation you want, then maybe you can be assisted..

    cam choice is the LAST thing to choose

    otherwise your into a catalog masturbation of trial and error, and never getting there

    stock except for the manditory RPM air-gap and holley HP. would like to keep it down as close to 5K as possible.

    i hate when that happens!

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    there is nothing out there that will take that setup to 500 hp

    sorry
    Charter Member - WAFNC, SBBR, KWOSG
    1955 Perfect Mate
    1986 Hornet III, 502-415 TRS

    www.donzi.org


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    Quote Originally Posted by BUIZILLA View Post
    there is nothing out there that will take that setup to 500 hp

    sorry


    really?



    what about a differant intake and carb?

  6. #6
    mrfixxall Guest

    Fixx

    Quote Originally Posted by Donzi_Dude View Post
    really?



    what about a differant intake and carb?

    425 hp max and the bottom end will blow..

    your engine has weak rods,3/8 to be exact and wont support 500 hp..

    isky 396271/281-14 cam

    find a set of pre 70's oval port closed chamber heads to raise the compression
    3856206 65 396 heads with 97 cc chambers
    3909802 67 396 with 101 cc chambers
    edelbrock air gap

    holly marine hp 750 cfm carb

    and scorpion roller rockers

    this combo will give you 425 hp with tons of torque but like i said your bottom end is limiting you to get 500 hp with out strokeing the engine to a 489..

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    i heard the slugs are the weakest link.

    sweet cam by the way!

    i was running an isky 280 in my olds over 20 years ago.
    Last edited by Donzi_Dude; 06-05-2011 at 04:22 PM.

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    What Heads ?

    We assume you are talking about small peanut port Hi-torque stock 330 heads ?
    They will greatly limit your horspower because of their low flow capacity .
    "BENCHSEAT 18" ~~YellowJacket~~ project owner~
    1929 Chris~Craft 28' Tripple Cockpit Mahogany Speedboat / A-120-A 845 Cu.In. 375 H.P. Chris~Craft V-8 racing engine.
    24' American Skier
    Super Eagle 454 HO Skiboat
    1991 454 SS Chevy Super Sport Pick-up for towing my "Toys".

    There is no such thing as going too fast ~ ~~
    OR~ Being too old~ for a new "Toy"!

    Brad Hunter
    Huntingdon Valley Pa (Just outside Philly)~
    Ocean City NJ
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    Quote Originally Posted by silverghost View Post
    We assume you are talking about small peanut port Hi-torque stock 330 heads ?
    They will greatly limit your horspower because of their low flow capacity .
    ya!

    to be sure!

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    I gotta ask......
    Why would you bother when there're so many 502's and other more "correct" engines around?
    George Carter
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    “If you have to argue your science by using fraud, your science is not valid"
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  12. #12
    GBond Guest
    Quote Originally Posted by gcarter View Post
    I gotta ask......
    Why would you bother when there're so many 502's and other more "correct" engines around?
    agree....

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    Some of the 330's had 2 bolt mains. worth checking that first.

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    2 VS 4 Bolt Main Caps

    The MK IV 4 bolt man bearing cap blocks have the words HI PERF PASS cast in large letters on the left side in fr'ont of the oil filter boss ara on the left side of the crankcase.

    2 bolt main cap blocks do not have this marking.
    "BENCHSEAT 18" ~~YellowJacket~~ project owner~
    1929 Chris~Craft 28' Tripple Cockpit Mahogany Speedboat / A-120-A 845 Cu.In. 375 H.P. Chris~Craft V-8 racing engine.
    24' American Skier
    Super Eagle 454 HO Skiboat
    1991 454 SS Chevy Super Sport Pick-up for towing my "Toys".

    There is no such thing as going too fast ~ ~~
    OR~ Being too old~ for a new "Toy"!

    Brad Hunter
    Huntingdon Valley Pa (Just outside Philly)~
    Ocean City NJ
    silverghost1926@msn.com
    215 947 4676 (PA Home)

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    Quote Originally Posted by silverghost View Post
    The MK IV 4 bolt man bearing cap blocks have the words HI PERF PASS cast in large letters on the left side in fr'ont of the oil filter boss ara on the left side of the crankcase.

    2 bolt main cap blocks do not have this marking.

    I used to think this was always true but my 78 Merc 330 had the Hi Perf Pass cast-in letters but when I opened it up...just 2 bolt mains. I still used the block but I converted it to 4 bolt mains and built my current engine. Maybe mine is an isolated cass.
    "1978" F-22; Turbo'd & Intercooled.

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