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Burnt Valve????

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Burt4x4, Jun 23, 2000.

  1. Burt4x4

    Burt4x4 3/4 ton status

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    Hey Dudes can a header exhaust leak at the flange damage an exhaust valve?? How do exhaust leaks effect the motor/heads other than make an anoying phat phat phat noise???



    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
    http://burt4x4.coloradok5.com
     
  2. MudFrog

    MudFrog 1/2 ton status

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    I've never heard of it damaging anything, only the annoying sound of air passing through the leak.
     
  3. Blazer1970

    Blazer1970 1/2 ton status

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    I have heard that running a motor without manifolds or headers can damage the exhaust valves by allowing the cold air to rush back in through the exhaust ports, and warping or cracking the valves. I have also heard people swear that this will not happen. I suppose if the header leak was bad enough, something like this could happen, but I doubt it.

    Tim

    1970 Blazer CST 4X4 350 SM465 NP205
    1987 Suburban 4X4 350
    1988 Chevy Pickup 4X4 350
     
  4. Burt4x4

    Burt4x4 3/4 ton status

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    Ok good, the leak I have is small, just enough to hear it.
    I think it will be allright, I have changed the gaskets to the copper ones but my flange is warped and I will get the thick deadsoft next but low on the priority list right now!
    Later

    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
    http://burt4x4.coloradok5.com
     
  5. turbo

    turbo 1/2 ton status

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    A leak won't hurt but running without manifold will burn/swallow valve.
    Just like a cutting tourch which actually burns steel by adding a stream of O2 to red hot metal fresh air will cause the exhaust valve to burn. So never run and engine without manifold or headers.
     
  6. getsome

    getsome 1/2 ton status

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    I kept blowing out my gasket on my headers because the headers were worped. I never had a problem except for the anoying sound it made. A friend of mine has a old Nova with the same problem and he said that he cured it by soaking a regular gasket in water then installed it but just snug with the bolts then let it expand. The next day he would torque the bolts down. I never tried it but he said it never failed him. Who knows. Just a thought.

    Getsome
     
  7. coopertwpk

    coopertwpk 1/2 ton status

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    Ithink those passanger side manifolds all leak napa sells new ones for 99$I'm planning on buying a set
     

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