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  1. #1

    How much to mill a 440js and 650sx head?

    Hi, im a new member and owner of a 650sx and a 440js. These are stock so far and my uncle works at a machine shop and will mill the heads for free. I am just wondering how much to mill each head and be good with 91 octane still? These will be modded with exhaust, intake, etc in future.

  2. #2
    Oh, and how much est. Horspower or mph will it help on a stock motor? Thanks

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