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  1. #46
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    Quote Originally Posted by baja200merk View Post
    You will need to loose the bridge in the exhaust and machine finger ports in the block.
    Thanks, Baja,
    Got access to a bridgeport so f/p will be no prob.
    any other suggestions, ie... exhaust chest, tuna dims ?

  2. #47
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    What pistons are you gonna run? Stock deck height?

    How hard do you want to turn it?
    Quartershot T-3R 15" E-Tec 1.62 sportmaster


  3. #48
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    dave recommends wiseco 3119 w/ fp added.

    Not sure on deck height or rpm yet, still got a lot to learn on how hard I can turn it.

    carbs & stock ign may be the limiter

    boat is 15'allison,

    already built a 15" mid & v4 gcase w/ v6 shaft. 2/1 gears
    Last edited by thornl01; 11-28-2013 at 06:01 PM. Reason: spel

  4. #49
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    Sounds like fun.

    Track down a cheap Yamaha ignition if you want to go that far. It should turn mid 8s on OMC with carbs and small prop.
    Quartershot T-3R 15" E-Tec 1.62 sportmaster


  5. #50
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    One bank finished, some polishing left.
    Have started marking new port edges on the other bank, started up some case-porting aswell...
    Looking forward to se your pics!Click image for larger version. 

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    I have matchported the block /sleves aswell, having a hard time to get the result on a picture becuse of the angle..Click image for larger version. 

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    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by Captain75; 11-29-2013 at 05:04 PM.

  6. #51
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    I want to relieve the exhaust using a snout, does anyone have access to a movie clip where I can get to hear what a looper sounds like using an exhaust snout?

  7. #52
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    Quote Originally Posted by Captain75 View Post
    I want to relieve the exhaust using a snout, does anyone have access to a movie clip where I can get to hear what a looper sounds like using an exhaust snout?
    http://www.screamandfly.com/showthre...e+exhaust+note

    You might find a few on here.

  8. #53
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    Quote Originally Posted by baja200merk View Post
    Theres a ton of room (read volume) to fill in the intakes around reed blocks and you can take .090 off the front half without having to grind too much (except #1 u have to grind a bunch, you will see why).
    On #1 are you referring to the hump in the roof of the reed block area?keep in mind that I have never cc'ed one of these crankcases, but looking through the front it looks like the starboard cylinders have alot more crankcase volume than the port cylinders due to the way they offset the reed blocks from the rod slots. Due you think they did it that way to counter act the flow vs crank rotation problem?

  9. #54
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    Quote Originally Posted by Captain75 View Post
    I want to relieve the exhaust using a snout, does anyone have access to a movie clip where I can get to hear what a looper sounds like using an exhaust snout?
    https://www.youtube.com/watch?v=ekAvA0kgSPM

    about 8500
    https://www.youtube.com/watch?v=Z7FJTOxKcP8
    Quartershot T-3R 15" E-Tec 1.62 sportmaster


  10. #55
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    Thornl01

    What kind of machines do you have access to? Buy some 3.3 sleeves, some pistons from Gordon and build a 2.2 V4. The displacement along with some good port durations would make for a neat little ride....

  11. #56
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    Quote Originally Posted by racer View Post
    .150 wider on each exhaust port at the top, make sure you radius them when finished. Clean up the rod slot and match the intakes being careful to maintain original angle since you are not looking for a high rpm engine.
    Any idea on how much hp's these mods can give me -if I manage to carry them out properly, of course...

  12. #57
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    Quote Originally Posted by Captain75 View Post
    Any idea on how much hp's these mods can give me -if I manage to carry them out properly, of course...
    you only need enough to pass a V6 Merc then stop the modes there

  13. #58
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    Racer, hope I can get your attention;
    I would like to make the main transfers slightly wider to be able to maintain the angle of entrance towards the boostport. Is that possible? How much wider is considered ok.
    I know that these cast iron ring should cope with a port with of at least 65% of cyl bore diam, but then it's the time/area thing...
    looking forward to some interesting replies!

  14. #59
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    Thanks for the suggestion, I will LOOK @ this.

    LT

  15. #60
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    which intake are you using?

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