3998993 head question - NCRS Discussion Boards

3998993 head question

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  • Michael C.
    Frequent User
    • May 31, 2003
    • 72

    3998993 head question

    Can anyone tell me whether the 3998993 heads with a C 73 casting date had hardened valve seats? I'd like to know whether I can run them on unleaded fuel without adding an additive or damaging the seats. Thanks!
  • John H.
    Beyond Control Poster
    • December 1, 1997
    • 16513

    #2
    Re: 3998993 head question

    I wouldn't worry about it - valve seat recession with unleaded fuel is pretty much a myth, unless you're towing a trailer at 100mph all day long. The additives don't do anything except eat the plating off the inside of your float bowls and lighten your wallet.

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