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Non stock springs and seat?

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    Non stock springs and seat?

    I picked up a used head, and took some valves out and found non-stock springs and seats, the retainers look stock.
    Stock on the left and what was in the head on the right. The inner spring is the same height as the outer and the seat doesnt have the steps that the stock one has.
    Has anyone seen this setup or know more about it? Manufacturer maybe? I compared them to some APE springs I have and the inner spring is shorter with them like stock.

    #2
    Vance & Hines used to have spring bases like that.
    Speed Merchant
    http://www.gszone.biz

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