I know that a of of the v8 guys use this stuff called highlamar or hylimar not really sure on the spelling but if this is for your car I would not recommend it. Copper h/d's are known to leak and are not good for a real daily driven car. Thats why a lot of guys who have race cars use them because the car gets pushed off the trailer and to the line blasts down the track and shuts it down.
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