383 LS1 Liberator Jet Boat - finally done!
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383 LS1 Liberator Jet Boat - finally done!

  1. #1
    Head Janitor FormulaZR's Avatar
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    Default 383 LS1 Liberator Jet Boat - finally done!

    Well…it’s finally done (mostly). All I have left to do is pressure test some the fresh water connections and put the back seat in.

    Specs:
    21’ Liberator with Dominator pump
    383 LS1
    238/244 Hyd. Roller
    MTI Stg 3 241 Cast Heads
    Yella Terra Rockers
    Rewarder Water Injected Through Transom Headers
    Edelbrock Performer Intake
    850 Carb
    MSD 6LS
    Closed Cooling System















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    Senior Member sandeggo's Avatar
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    Nice job is there a reason you went closed cooling?

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    Head Janitor FormulaZR's Avatar
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    Quote Originally Posted by sandeggo View Post
    Nice job is there a reason you went closed cooling?
    Thanks!

    and yeah, there are several reasons I went with semi closed cooling...

    1) At the time of the first LS1 swap, I would've had to fab the water ports to use open cooling - and I work construction on the road and didn't know/trust any fabricators in the area I was in. Now several companies (like Moroso) make these ports and it wouldn't be an issue now.

    2) I know now that there are inline t-stats, but I didn't really know that then - and a "cold" running LS1 isn't good. Since the t-stat on an LS1 is in the water pump housing, I just thought it'd be easier to keep it.

    3) I got a GREAT deal on the heat exchanger. I actually bought a pair of heat exhangers for $75.

    4) Some of the lakes I go to have brine water - brine water + aluminum really isn't that good.

    5) Winterizing is a breeze!

    6) If I put this engine back in a car at some point, I don't have to worry about mud/rocks/other trash being in the engine just waiting to plug my radiator or heater core.

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    Senior Member sandeggo's Avatar
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    I went open with mine but I only boat in the Colorado river. I made motorplates out of 3/8" aluminum and tapped it directly for 1/2" NPT for my water lines. I'm very anxious to see how your setup performs. Can't wait to see one of these in a gullwing
    Last edited by sandeggo; 06-01-2011 at 08:05 AM.

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    Head Janitor FormulaZR's Avatar
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    Quote Originally Posted by sandeggo View Post
    I went open with mine but I only boat in the Colorado river. I made motorplates out of 3/8" aluminum and tapped it directly for 1/2" NPT for my water lines. I'm very anxious to see how your setup performs. Can't wait to see one of these in a gullwing
    I'm also very anxious to see how it runs.


    You're running an iron block 5.3, right?

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    Love it!!! Details on the closed cooling please... looks like a mix of some auto and some marine parts. what size heat exchanger, etc?

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    Head Janitor FormulaZR's Avatar
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    Quote Originally Posted by slim pickens View Post
    Love it!!! Details on the closed cooling please... looks like a mix of some auto and some marine parts. what size heat exchanger, etc?
    Thanks a bunch!


    Closed cooling was a breeze. When I was working in Corpus Christi, TX I called a guy who had two used heat exchangers for sale. I bought both for $75, and this was the better one.

    It's supposedly from a 5.7 Mercruiser; but I've had several people who run HE's on big blocks tell me it's at least as big was what is used on a 7.4, if not bigger. SO...I can't tell you what it's from, but I can get you measurements tonight. EDIT: It's 16.5"x3.25"

    Anyway, it's plumbed just like a radiator would be, and I'm using the stock LS1 water pump. It's spaced out 1/4" because of the motor plate; so I just had the stock tensioner milled down 1/4" so all the pulleys line up correctly.

    From the pump, I have a water pressure relief kit (no sense in blowing the HE apart with 100 psi water) and runs a 5.8" hose in and 5/8" hose out.

    I have a T in the line before the water pressure relief kit, and that is what feeds the water injected headers (with full pressure from the pump).

    The engine is 100% auto...
    Last edited by FormulaZR; 06-06-2011 at 05:14 PM.

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    Senior Member motomattox's Avatar
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    Awesome! Looks good. Dig the whole thing!
    "Keep talking...it aint often I get to hear a genius speak"

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    Senior Member cave's Avatar
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    Going to be fun watching this thread. Good luck. I hope it all works out.
    Takin it home

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    Tested it on a little pond tonight. So far good news...no leaks, except the headers pressure T comes on a little early. I have 1 washer in it to shim it...but I guess I need more.

    I do need you guys advice, though. With a 330 hp BBC the pump wouldn't spin over 5000 rpm. But, with this motor I hit the 5900 rpm rev limit pretty quick. This was just on a trailer - will this "load" more when it's actually pushing the boat?

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    21 Daytona Outlaw's Avatar
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    Quote Originally Posted by FormulaZR View Post
    Tested it on a little pond tonight. So far good news...no leaks, except the headers pressure T comes on a little early. I have 1 washer in it to shim it...but I guess I need more.

    I do need you guys advice, though. With a 330 hp BBC the pump wouldn't spin over 5000 rpm. But, with this motor I hit the 5900 rpm rev limit pretty quick. This was just on a trailer - will this "load" more when it's actually pushing the boat?

    Yes
    #55

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    Senior Member zacho!'s Avatar
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    Quote Originally Posted by Outlaw View Post
    Yes
    x2
    Last edited by zacho!; 06-01-2011 at 07:35 PM.

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    Senior Member sandeggo's Avatar
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    Get in the msd box and bump that sucker up to 6500

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    Quote Originally Posted by Outlaw View Post
    Yes
    That's what I figured, but just wanted a 2nd opinion. BTW, that's a gorgeous Eliminator you did!

    Quote Originally Posted by zacho! View Post
    x2
    Good!

    Quote Originally Posted by sandeggo View Post
    Get in the msd box and bump that sucker up to 6500
    In time...baby steps.

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