454 heads
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454 heads

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    Cole SS cole ss's Avatar
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    Default 454 heads

    I have a 1990 stock 454 hardin marine engine, 330 HP. I am trying to find out information on this motor, such as compression ratio. I assume cast pistons and two bolt mains. My head casting number is 14092360. I know it is open chamber, I assume large oval ports. I can't figure out how many CC chambers, or what size valves. Any information would be helpful. Thanks

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    Senior Member lbhsbz's Avatar
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    you've got "peanuts" should have 2.06/1.72 valves, open chambers

    Can't find anything on runner size though.

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    14092360...86-90...oval...OPEN...454 Truck, "peanut" round ports

    Yep, that would be the SMALL oval ports, not good for hot-rodding this ap.
    Intake ports are generally in the 200cc ballpark, but I am not able to find that specific one.

    They'll choke a motor off once you get above about 4-grand, and most of the lift of a decente cam will go unused as well.
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    Cole SS cole ss's Avatar
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    The heads do say PASS on the on them does that make any difference. What kind of compression would be used with these heads? What heads should I use with stock pistons?

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by cole ss View Post
    The heads do say PASS on the on them does that make any difference. What kind of compression would be used with these heads? What heads should I use with stock pistons?
    Depends on what you want in the end.

    You'll get a good (perhaps borderline high) compression with flat-top pistons under a closed chamber head (have to do the math to know exactly).

    Closed chamber heads don't flow as well as open chamber heads.

    Open chamber heads will need domed pistons for a decent compression ratio.

    You CAN do pretty decently just lacking compression.
    My rebuild 4 years ago had no $$$ available to change pistons, so I am running a very lame about 8.3:1 under my '049 open chamber heads.
    Careful cam selection, intake, headers, and head porting work have me turning right at 500HP @5,400RPM. with very strong throttle response.

    IMO unless you are after high RPM (6-grand & up), look for a set of '049 or '781 castings (or go for a large oval port aftermarket), consider at least having the large factory valves put in the oval port heads (2.19"/1.88") and put an apropriate set of pistions under them to get to a ballpark 10-10.5:1.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
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    Senior Member ol guy's Avatar
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    Quote Originally Posted by cole ss View Post
    I have a 1990 stock 454 hardin marine engine, 330 HP. I am trying to find out information on this motor, such as compression ratio. I assume cast pistons and two bolt mains. My head casting number is 14092360. I know it is open chamber, I assume large oval ports. I can't figure out how many CC chambers, or what size valves. Any information would be helpful. Thanks
    mortec.com all questions answered and no precision qeuss work. Pull the numbers off the flywheel end of the motor for the block,crank and rods. Passenger side where the belhousing would bolt up on top. You have the numbers for the heads that will give the correct description.m

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    Cole SS cole ss's Avatar
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    What kind of compression ratio would I have with the 14092360 peanut heads? I have no idea. My motor is stock 454 330HP. The number that I get off the block is 9069286 ( the best I can read .) It is hard to read because of casting. Mortec shows a 10069286, are they similar? I have always been a ford man so I am not sure did with their casting numbers. Maybe I am not reading it right. My boat is a 1990 Cole 20' SS jet. Would switching to 049 heads raise my compression ratio? Thanks Kimball

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    From the looks of it, most GM open chamber heads seem to run from 112 to 120cc's.

    ASSuming a std. bore/stroke 454, a .039" gasket (fairly typical) with a 4.250" (matching) bore, 115cc chamber, flat-top pistons, and a .015" BELOW deck piston height (fairly comon/close in stock parts setups IMO),

    I get 8.29:1.

    a 25cc dome will get it to 10.07:1

    Get the deck height to 0.0", get to 10.39:1.


    It's still going to wheese like a smoker with emphysema over about 4-grand tho.

    Good luck to ya.

    Build the rest of it and plan to add a set of large ovals later on perhaps, spending nothing not absolutely needed in those heads.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    '049's have an aprox 120cc chamber also, exactly what just depends on the head. I've seen them listed at 122 and 123, I've seen people claim to have them in the 118/119 area.

    So basically, no change in the CR, just better 4-6krpm breathing.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    Cole SS cole ss's Avatar
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    Thanks for the info. Swapping heads sounds like a good idea. I don't think I could not resist port matching, and blending valve pockets on a good set of large oval port heads. How much compression ratio can you run, and still run on pump gas? Thanks, Kimball

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    On a typical, NON-THERMOSTATED jet-boat, running arround 140* cooling water outflow, you can run close to 11:1 from what I have been told by long-experienced hands, on IRON HEADS. Aluminum gets you another point roughly.
    Oh, 91 octane premium btw.

    I would leave a margin personally and aim for about 10.5 on iron, 11 on magic white-metal.

    Up the temperature, lower the CR.
    A guy on here some time back blew holes in pistons after putting in a t-stat, simply from being borderline but safe as it WAS running. Raised engine/head temp, triggered detonation.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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