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Thread: Reviving A HM 289... Part 2...

  1. #1
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    Reviving A HM 289... Part 2...

    I'm baaaaaack...

    It's time to liven up the bottom end of this 289 ant top it off with 16:1 compression and a little 500 shot of nitrous. Do ya think my stock drive will handle it?



    Boats are cheap if you do all the work yourself.
    Gas.... Not so much...


  2. #2
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    Okay.... Lets go back to reality.

    I decided to go conservative on the build since I'm keeping the out drive stock. I should make "just a little" more power but I was more concerned with making the bottom end bulletproof and efficient.

    I found a nice, inexpensive oil pan that will hold 2 extra quarts and has a baffle to keep the slosh down on launch. This new pan should work nicely and looks good too!







    I had a local performance shop that specializes in Ford racing engines prep the block for me. I had it bored 30 over, line honed, rod ends resized and balanced as well as new pistons pressed in.

    These pistons, in combination with my 54cc heads should yeald a little over 9.5:1 compression.







    Here's dad installing the aftermarket cam that was in the engine when I got it. I'll be measuring the lift and duration before I finish it off.



    ARP Studs! WOOHOO! Why? You'll see....



    Droppen in the crank!



    Hey Look! A windage tray! Since this engine sees 6K RPM for hours on end, I figured this would be a worth while investment. For those of you who don't know what a windage tray does, it keeps the tornado of oil flying around in your crankcase to a minimum thus keeps the slosh of oil from robbing horsepower.



    Dad and I installing rings and bearings.





    Building makes me happy...









    The heads had some minor porting work and resurfacing but the valves received the royal treatment with a very nice performance grind.





    Anyway, my progress so far... more to come!!!



    Boats are cheap if you do all the work yourself.
    Gas.... Not so much...


  3. #3
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    Nice documentation.

    "Since this engine sees 6K for hours on end. . . ." Huh?
    “Oh right, because you walked into strippers discount warehouse and said ‘Help me showcase my intellect.’” - Archer

    Bill
    Grand Rapids, Michigan
    1985 Donzi Criterion SS
    1967 Donzi 16 Ski Sporter, C16-409, Has a new home!
    38' Carver Aft Cabin
    1968 Sea Ray SRV 180 w/1975 70 hp Evinrude
    10" RIB w/15 hp 1984 Evinrude

  4. #4
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    Quote Originally Posted by Just Say N20 View Post
    Nice documentation.
    Thanks! Yeah, I use forums a lot to learn so I like to give back especially when it's a fun project.

    Quote Originally Posted by Just Say N20 View Post
    "Since this engine sees 6K for hours on end. . . ." Huh?
    Did I forget to mention my new 400 gallon fuel tank?

    No... I guess I mean more of a "cumulative" thing being out on the lake all day. A few days are putt-putt but most of the fun lives at WOT.

    In other news UPS stopped by today with some new toys...







    Also, forgot to mention I installed a high volume oil pump and added ARP's industrial strength oil pump drive shaft. I think it was a wise investment for a little extra piece of mind.

    This thing is BEEFY!



    Boats are cheap if you do all the work yourself.
    Gas.... Not so much...


  5. #5
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    Quote Originally Posted by Just Say N20 View Post
    Nice documentation.

    "Since this engine sees 6K for hours on end. . . ." Huh?
    +1

    Great thread(s) and pictures. I learn a ton from this stuff and I'm always amazed when DIYers (no offense intended!) turn out such top quality stuff.

    Makes me think I should try to do more than just check the oil!
    Nah.....


  6. #6
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    Great stuff Evil....Keep it coming....

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