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Re: 72 K10 LQ4 swap overflow bottle question
You dont need an overflow bottle, but without one you cant fill the radiator all the way to the top. This is the reason original radiators have the full level a few inches doen from the top, there needs to be room for expansion when the coolant is warm. If you over fill it, it will just puke out the excess then when it gets to the level it can safely hold it will stop, this will be the full level.
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