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I'm thinking

  1. #1
    Banne'd Cobra1's Avatar
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    Default I'm thinking

    this




    With this



    In my 20' tunnel/deck boat would make a good little drive package.

    Yes or no???

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  3. #2
    Super Moderator HammerDown's Avatar
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    Thumbs up

    I've been thinking the very same thing (engine wise) for a few years now. And research tells me the big HP 12.0:1 572 can run off pump(93 octane) gas if the total timing is backed down to some 28 degrees.
    I still have the issue of Hot Rod Magazine (June 04)with the write up they did...they also ran it on pump gas >91 octane.
    Duane from HiTech Performance has installed a few with very good results. For my peace of mind I would tear it down and check all clearances.
    Note...after a mild tune-up peak corrected HP was 801 @ 6,300 rpm and 738 lb-ft at 4,500 rpm this of course with more total advance and race fuel.
    Lets buy two and get a discount!
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  4. #3
    Senior Member desrtrat256's Avatar
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    Ive always wanted to to an LS series motor. why hasnt it been done yet. Fuel injection, light weight, small block that will still make 600 reliable horse power and equal in torque. decent gas mileage and alot of adjustability with a laptop. And the best of all is it can still be done relatively cheap

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  6. #4
    Banne'd Cobra1's Avatar
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    Quote Originally Posted by HammerDown View Post
    I've been thinking the very same thing (engine wise) for a few years now. And research tells me the big HP 12.0:1 572 can run off pump(93 octane) gas if the total timing is backed down to some 28 degrees.
    I still have the issue of Hot Rod Magazine (June 04)with the write up they did...they also ran it on pump gas >91 octane.
    Duane from HiTech Performance has installed a few with very good results. For my peace of mind I would tear it down and check all clearances.
    Note...after a mild tune-up peak corrected HP was 801 @ 6,300 rpm and 738 lb-ft at 4,500 rpm this of course with more total advance and race fuel.
    Lets buy two and get a discount!


    Well all I have to do is get my HIN from the Coats Gaurd, a Bus. licence, and buy them at OEM prices. Oh yes that will save a bunch.

    What's the cam profile like? I haven't looked at that yet, might have to change that??

  7. #5
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by Cobra1 View Post
    Well all I have to do is get my HIN from the Coats Gaurd, a Bus. licence, and buy them at OEM prices. Oh yes that will save a bunch.
    ... What's the cam profile like?
    Well hurry up and get that licence...I'm waiting!

    Cam info on the 12.0:1 720 HP 572
    Mechanical Roller 0.714//0.714 lift
    266/274 duration @ 0.050
    If I recall correctly what I was told a shop does is to change out the oil pan, swap the Demon carb for a marine (liability reasons )back down total timing and instruct the boat owner to break in the engine easily.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  8. #6
    jetboataholic HawaiianJet's Avatar
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    Wink

    Quote Originally Posted by desrtrat256 View Post
    Ive always wanted to to an LS series motor. why hasnt it been done yet. Fuel injection, light weight, small block that will still make 600 reliable horse power and equal in torque. decent gas mileage and alot of adjustability with a laptop. And the best of all is it can still be done relatively cheap
    Here ya go, Eagle has done em all. LS2


    And my personal favorite. LS7




    Actually this one is my favorite.


    Last edited by HawaiianJet; 09-21-2008 at 07:58 PM.
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

  9. #7
    jetboataholic HawaiianJet's Avatar
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    Question

    What is everybody's opinion on the Legend drives? You don't see too many of them around, and I remember a thread about the best jet pumps, and Legend didn't end up in anyone's top 5.
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

  10. #8
    ....like warm apple pie RaceFace's Avatar
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    Have you priced that beast?

    You can build one for cheaper using better aftermarket parts. That ZZ572/720R requires 110 fuel (12:1 compression) and the cam in it would probably need to be changed to be more 'jet boat friendly'.

    By the way, the list on that is $19,568.
    Race

  11. #9
    Senior Member CK7684's Avatar
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    If I had to do mine over again, I would just buy a 572. I have just as much $$$ into my 468...

  12. #10
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by RaceFace View Post
    Have you priced that beast?

    You can build one for cheaper using better aftermarket parts. That ZZ572/720R requires 110 fuel (12:1 compression) and the cam in it would probably need to be changed to be more 'jet boat friendly'.

    By the way, the list on that is $19,568.
    Wow the price has really gone up! Few years back it was +- $14K.
    And again...Hot Rod mag did the test and it did run fine on 91 octane "pump gas" by just backing the total timing.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  13. #11
    ....like warm apple pie RaceFace's Avatar
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    Quote Originally Posted by HammerDown View Post
    Wow the price has really gone up! Few years back it was +- $14K.
    And again...Hot Rod mag did the test and it did run fine on 91 octane "pump gas" by just backing the total timing.
    Which issue? Im looking at the Oct 2008 issue right now. They tested 8 GM crate motors in a '69 Chevelle, one of them that motor and all they did to that motor for the test was back the jets off because it was running fat. No timing change.......or did I miss that page?
    Race

  14. #12
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by RaceFace View Post
    Which issue? Im looking at the Oct 2008 issue right now. They tested 8 GM crate motors in a '69 Chevelle, one of them that motor and all they did to that motor for the test was back the jets off because it was running fat. No timing change.......or did I miss that page?
    As I mentioned in post #5...HOT ROD June 2004 page 20. They do a nice write up on 572/720 HP 12.50:1 AND run it on 91 pump gas!
    Fully tuned on race fuel it made 801 HP.
    I'll scan in a few pages later and post it up.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  15. #13
    ....like warm apple pie RaceFace's Avatar
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    Quote Originally Posted by HammerDown View Post
    As I mentioned in post #5...HOT ROD June 2004 page 20. They do a nice write up on 572/720 HP 12.50:1 AND run it on 91 pump gas!
    Fully tuned on race fuel it made 801 HP.
    I'll scan in a few pages later and post it up.
    No biggie, I was questioning whether I was blind or not in this new issue. I have long since thrown away my '04 Hot Rod and I have drank alot of beer since then, so those memory cells are long gone! LOL!!!!
    Last edited by RaceFace; 09-22-2008 at 03:40 PM.
    Race

  16. #14
    Super Moderator HammerDown's Avatar
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    Here's a few pages...

    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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