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valve stem seals

  1. Best valve stem seals for '69 390 gt

    All Ford Techboard
    Hi, I am putting together my '69 S code Mach 1, I need to know which valve stem seal will work best with stock cast iron GT heads, I have heard about issues with both Viton and Teflon and their oiling differences, which of these seals would work best on un modified valve stems and bosses...