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Thread: 604 breathers

  1. #1
    Join Date
    Nov 2019
    Location
    Madison, Va
    Posts
    15

    Default 604 breathers

    I installed a brace on my chassis which required removing the rear valve cover breather and capping the hole in the valve cover. Will running the engine this way cause any issues?

  2. #2
    Join Date
    May 2007
    Location
    Kansas
    Posts
    1,647

    Default

    It will cause the air volume to increase the speed of the air out just one breather, thus carry more oil vapor out and puke oil out of that one breather.

    You still have to vent said amount of air out of the engine and now it's coming out of just one tube thus increasing the speed of said air. As long as it's not puking oil out, it shouldn't be a big issue but if it's creating pressure inside crankcase it could have a tendency to blow out gaskets and leak oil.

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