Excessive oil deposits on #1 spark plug.

Discussion in 'Troubleshooting & Diagnosis' started by 78BBODY, Sep 6, 2021.

  1. MChamp

    MChamp Veteran Member

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    I think you found it. There's alot of forces in play there. Change the gasket my thinking.
     
  2. biker

    biker Veteran Member

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    Dry fit the intake with all the sealing surfaces clean and make sure that it is fitting squarely against the sealing surfaces. If you don't know the history of the engine, the heads and/or block could have been resurfaced, causing a fit issue. You can get a thicker gasket to compensate if needed.
     
  3. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Oil can get into the cylinder from poor ring seal, valve guide seals or the intake gasket.
    If there is oil between the intake gasket and head surface... I think you found the source.

    It might be worth the effort to replace valve guide seals while you're there. (Cheap parts and fairly easy to replace.)
    Your call on that.
    How many miles on the engine?
     
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  4. 78BBODY

    78BBODY Member

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    Fingers crossed
     
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  5. 78BBODY

    78BBODY Member

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    My guess is they have. I bought a gasket with similar thickness so hopefully it works first try.
     
  6. 78BBODY

    78BBODY Member

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    Miles are unknown. For sure though it's not the original engine. Looked up the block casting on back 14010207, and from what I've found, it's between a 80-85 GM truck 350 or passenger car. Car has 92k kilometers though.
     

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