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Thread: Ported Cases

  1. #1
    Chrisrokc's Avatar
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    Ported Cases

    Is this needed or done by most of you that have 1390 setups?


  2. #2
    philip_gpr's Avatar
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    not mandatory

    improves acceleration - mostly raises mid range HP

    the 1390 pistons will hit the cases so the cases have to been grinded on a bit to provide clearance - easy to do - you can even do it yourself

  3. #3
    Chrisrokc's Avatar
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    Yea, I figured I would have to do that. I also remember reading it some where. I think the 1390 Group-K write up. I have tools for taking off metal and an air tool for it so that will be easy.


    Thanks for the info, just wanted to see what the whole ported cases thing was about.

  4. #4
    Moderator OsideBill's Avatar
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    After hearing several sides on this. I opted not to port my cases figured I could always do this later if I feel the need.

  5. #5
    All hail the Chief! fullboogie's Avatar
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    It costs virtually nothing, so if you're sending out your jugs to get done, why not get the cases ported?

  6. #6
    mtrager's Avatar
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    I just paid Lowell 130 dollars to do mine. Have not really pounded on it
    next to anyone . Elliott rode that ski at the Tampa drag races against
    some tiny fast people and with the set up on the ski it sure ran faster than it should have.

  7. #7
    Moderator OsideBill's Avatar
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    Quote Originally Posted by fullboogie View Post
    It costs virtually nothing, so if you're sending out your jugs to get done, why not get the cases ported?
    Cost was not the issue. I had more than one tuner tell me how sensitive the cases are in the GPR, and that you are better off putting your money somewhere else. I listened to them, my decision. Lowell told me if I was running anything but the VF-III reeds with spacer, he would have strongly suggested I do the case porting. I personally feel this is still a grey area. Just my opinion.

  8. #8
    Duke's Avatar
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    Quote Originally Posted by osidebill View Post
    Cost was not the issue. I had more than one tuner tell me how sensitive the cases are in the GPR, and that you are better off putting your money somewhere else. I listened to them, my decision. Lowell told me if I was running anything but the VF-III reeds with spacer, he would have strongly suggested I do the case porting. I personally feel this is still a grey area. Just my opinion.
    I've heard the same thing by a few tuners as well. Some are actually epoxy filling the cases in the reed opening area to decrease volume.

  9. #9
    All hail the Chief! fullboogie's Avatar
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    I guess my point, which I didn't make very clearly, is that I have had success with my setup (which includes ported cases) and would recommend it. And since Lowell charges next to nothing to do it, I would recommend it even more. Just my two cents.

  10. #10
    sleeplessnMS's Avatar
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    I run stock cases....

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