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Which side should header gaskets face?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Blazer79, Mar 10, 2002.

  1. Blazer79

    Blazer79 1/2 ton status

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    I got a pair of Felpro exhaust manifold gaskets. One side is aluminum, the other side looks like asbestos. Which side should be facing my <font color=blue>Thorley</font color=blue> /forums/images/icons/wink.gif header?

    Thanks.
     
  2. schwinnd

    schwinnd 1/2 ton status

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    The metal side faces the exhaust manifold, away from the block.
     
  3. 79Beast

    79Beast 1/2 ton status

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    Always put the shiny side toward the heat source. When in doubt, contact the manufacturer.
     
  4. Blazer79

    Blazer79 1/2 ton status

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    OK, it sounds like we need someone else to tip the scale.

    I just installed them, and put the shiny side facing the header, but I'm thinking probably 79Beast is right and I should flp them.

    Does anybody know if felpro has a website? felpro.com didn't work.

    Thanks.
     
  5. 79Beast

    79Beast 1/2 ton status

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    My thinking is that if you already installed them, dont take them back off. Retorque the header bolts FREQUENTLY for the first five or so heat cycles. After that, with every oil change. If my advice is different from the manufacturer, remember that my method is experience based. Do what works for you.
     
  6. schwinnd

    schwinnd 1/2 ton status

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    I just put some on when I put the new heads on the motor and the directions said to face the the metal side to the header.
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Those aren't header gaskets. Those are manifold gaskets.
     
  8. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    I have used manifold gaskets on headers and they work great (assuming the header flange in not too warped). They don't blow out and seem to help keep header bolt torque retention. The papers ones blow out too easy in my opinion (usually why they are cheaper), and I have also had good luck with copper and dead soft aluminum ones.
     

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