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  1. #436
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    [QUOTE=Captain75;2983533]Just put this block out for sale here in Sweden...
    Attachment 385199

    This baby was sold a couple of weeks ago to norwegian guy and his father, with the intention to power a custom made boat just exiting the mold.
    They came all the way by car, and were really nice people! Hope the block and all the porting hours will make them happy

  2. #437
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    Still waiting for my pistons to arrive from the U.S. In the mean time I am working with the cooling system. Since this closed deck will use an open deck thermo and control valve arrangement, I need to adjust at least to things:
    1. Remove the poppit valve next to cyl no 2 and replace this one with an alu cover and a fitting. The coverplate has been made, but my question is how big should the outlet be?
    2. The block needs to be tapped in order to fit the open deck control valve.
    Click image for larger version. 

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    plate and possible fittings.

    brw; can anyone give me the inside dia of the stock cooling hoses used on the open deck? I am not at home so I can’t take a measurement.

    //Anders
    Last edited by Captain75; 11-06-2017 at 06:46 AM.

  3. #438
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    Finally, my pistons and bearings arrived from the U.S.!!

    Click image for larger version. 

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    Beautiful stuff!
    Right now trying to decide wheather I should enlarge the f/p holes to match the sleeves!?
    The small paper sheet in front of the piston is a rub-off copy of the lower part of the sleeve, where the mixture will enter on its way to the ports.
    There is definately a difference in size, I just feel an aversion towards the idea of grinding these beautiful parts. But if it will provide more power then I will do it
    Last edited by Captain75; 11-11-2017 at 04:21 PM.

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  5. #439
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    Project moving forward, slowly... A bit too much at work and two of three sons having hockegames every weekend.

    modifying the new pistons:
    Click image for larger version. 

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    Click image for larger version. 

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    Difference between stock and modified f/p windows.

  6. #440
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    Looks good! I did the same to mine. Are you going to weigh the pistons and try to match them?
    1975 Hydrostream Ventura II
    1987 evinrude 200xp

  7. #441
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    Quote Originally Posted by NosBoss View Post
    Looks good! I did the same to mine. Are you going to weigh the pistons and try to match them?
    I will try in the same way I did during the 2.7 build earlier in this thread.
    Those were stock, hope these forged ones are closer from the beginning...
    Click image for larger version. 

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  8. #442
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    I have one at 470 grams, 4 around 477 and one that is .010 bigger at 480. Not sure if I can get ten grams off that one.
    1975 Hydrostream Ventura II
    1987 evinrude 200xp

  9. #443
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    Quote Originally Posted by NosBoss View Post
    I have one at 470 grams, 4 around 477 and one that is .010 bigger at 480. Not sure if I can get ten grams off that one.
    If you look on the inside you can see the pistonwall being thicker around the f/p windows, perhaps you could find 10g there?

  10. #444
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    What about the two protruding pieces sticking down from the top? They're small. I'm unsure why they are even there. I figured I would start by grinding them off.
    1975 Hydrostream Ventura II
    1987 evinrude 200xp

  11. #445
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    Quote Originally Posted by NosBoss View Post
    What about the two protruding pieces sticking down from the top? They're small. I'm unsure why they are even there. I figured I would start by grinding them off.
    I think one of them covers one of the piston ring stoppers.
    I think the other one use to do the same when the other pin used the stock location - in the fingerport area. Compare to a stock piston and you will see what I mean.

  12. #446
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    I just got home and took a look. You're right. The ring pins are in those spots.
    1975 Hydrostream Ventura II
    1987 evinrude 200xp

  13. #447
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    All f/p windows done. Once a have an evening available, I will make the final weight adjustments before starting reassebly.
    Click image for larger version. 

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  14. #448
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    Good lookin work there Capt.!!!!!
    Gary
    "12" Super Lite Tunnel (11') "88" 25 Yammy twin carb "BANANA SPLIT"
    "77" Hydrostream Viper "87" 140 Rude heavy modded w/15" mid, Bobs nose and lwp (in progress)
    "Too much is never enough" Keith Richards " Dreams become reality via hard work and perseverance" G.A.Carbonneau

    "This coming from an old man that strapped two bananas together, hung a motor on it and calls it a boat" XstreamVking

  15. #449
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    Yup, looks good! What did you use to enlarge the holes? I used a reamer and cleaned it up with a dremel. Mine turned out nice.
    1975 Hydrostream Ventura II
    1987 evinrude 200xp

  16. #450
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    Quote Originally Posted by Captain75 View Post
    If you look on the inside you can see the pistonwall being thicker around the f/p windows, perhaps you could find 10g there?
    Drill it out off the pin?

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