Got my first Jet boat
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Got my first Jet boat

  1. #1
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    Default Got my first Jet boat

    Hello all,
    As stated above this is my first Jet boat. Itís a 1977 Tahiti Day cruiser. It has a Ford 460.
    A friend from work is helping with the motor. We yanked it last weekend and the block and heads are in the machine shop at the moment. This is a low budget build so most everything will remain stock for the moment. The block is within spec and doesnít like itís ever been rebuilt.

    Anyhow, in preparation for the rebuild and install I realized that marine specific parts were more expensive than vehicle parts so my question is: Do I need marine specific parts for hitting the reservoirs in this desert I live in? (New Mexico)

    Iím looking at a Holley 4150 (750cfm) carb, and an msd 8580 Distributor not sure which box yet.

    Thanks in advance for the feedback.


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    AKA OhOneWS6 Last Mohican's Avatar
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    Does it have an engine cover? Many of the marine parts have modifications to make them safer in a marine environment and in particular in an enclosed engine compartment. Carb, Mechanical fuel pump and distributor are a few of these parts. Some marine parts are manufactured differently for durability. Wire, seat foam and vinyl would be examples of this.

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    Yes it does have an engine cover.

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    Head Janitor FormulaZR's Avatar
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    Quote Originally Posted by Last Mohican View Post
    Does it have an engine cover? Many of the marine parts have modifications to make them safer in a marine environment and in particular in an enclosed engine compartment. Carb, Mechanical fuel pump and distributor are a few of these parts. Some marine parts are manufactured differently for durability. Wire, seat foam and vinyl would be examples of this.
    Don't forget alternator!


    "No, my boat doesn't need any more power" - No one ever

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    My cousin owns an alternator shop and rebuilt it for me. It's a marine alternator.

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    Senior Member Brendellajet's Avatar
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    Make sure you do some research related to engine tolerances for boats. What works in a car usually doesn't work too long in a jet boat. Make sure your machinest understands, and consider asking some questions once you know the answers to make sure he knows his business.
    "He is a lover, not a fighter. But he's also a fighter, so dont get any ideas."

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    Dunno where you're located but here in MI if the engine has a cover it must have a marine specific carb with the "J-tube" bowl vents that would effectively purge the gas into the motor rather than ONTO the motor with an automotive application carb. There's also other marine specific qualities about those carbs too. Like a slotted rod that the throttle plates mount to, this also helps to contain fuel leaks. You can read up on this stuff in manufacturers sales literature.

    An enclosed hatch must have a inlet and outlet vent with a functioning blower to purge the compartment of gas fumes.

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    congrats fellow tahitian. post up some pictures asap!

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    Quote Originally Posted by FormulaZR View Post
    Don't forget alternator!
    starter.

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    Quote Originally Posted by ka0tyk View Post
    congrats fellow tahitian. post up some pictures asap!
    x2 lets see that Tahiti!

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    Quote Originally Posted by ka0tyk View Post
    congrats fellow tahitian. post up some pictures asap!

    Thanks,
    60%

  14. #12
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    Looks nice Angel. What length? The trailer looks in good shape: unlike mine. Just finished fabricating whole new bunks, rollers, and even a cross beam!

    -Tyler

  15. #13
    www.highflowdynamics.com LakesOnly's Avatar
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    Cool

    Use a Holley 850 Double-Pumper, List # 0-80443 marine appicable. With this carburetor you will still be able to troll around on the primary 2-barrels and get very good fuel economy. You will also allow the engine its needed upper rpm breathability with all 4 barrels of the 850 when you are wide open throttle.

    For the 460 in your day cruiser, use a fully-grooved main bearing (Clevite or King) or a 3/4-grooved main bearing (Federal Mogul or King). You rods will very much appreciate the additional oil feed. Do not use a typical 1/2-grooved engine bearing in your build.

    LO
    High Flow Dynamics
    Performance Components for the 429/460 Engine Family


    This post © Copyright 2007-2017 Paul Kane. No copying, linking, printing or otherwise without express written permission.

  16. #14
    AKA OhOneWS6 Last Mohican's Avatar
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    That 80443 is the same carb I have on my boat. There are two other basically stock big block's in my area running the same carb with great success right out of the box. One is a 460 BBF the other is a 454 BBC. Both are cruisers with engine covers.

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