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Exhaust Manifold

Discussion in '40- & 55-Series Tech' started by jrcfj40, Jun 5, 2017.

  1. jrcfj40

    jrcfj40 SILVER Star

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    IMG_7233.JPG IMG_7234.JPG IMG_7235.JPG I'm looking for some advice regarding the exhaust manifold surface that mates to the heat riser/intake.

    Do I need to clean up the surface any further(see pictures) or will the gasket compensate for the irregular surface? If so, what should I do to clean up?

    I do plan to eliminate the heat riser and use the stainless block off plate.

    Thanks for your help!
    Jeff
     
  2. Vae Victus

    Vae Victus Posting more than I know

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    Looks like you never got a response. I'll take a crack at it. I think it's more important that the intake and exhaust surfaces are milled to the same thickness, and the gasket takes care of the unevenness in the mating surface.

    However that's a lot of pitting. Hopefully a true expert will correct me.
     
  3. spotcruiser

    spotcruiser Geezer SILVER Star

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  4. Spike Strip

    Spike Strip Adorable Deplorable SILVER Star

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    I had the same thing with mine and I cleaned it up with a 90* die grinder and a mild disc. worked fine.
     
  5. JackA

    JackA

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    It looks like part of an old gasket is still stuck to that surface.
     
  6. PG45er

    PG45er

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    A little more cleaning with about a 120 grit firm backed disk keeping it as flat as possible, just enough to get the remaining rust and a definite 2nd on the remflex gasket.
    [​IMG][​IMG]

    upload_2017-6-19_9-27-36.jpeg

    upload_2017-6-19_9-28-41.jpeg
     
    Last edited: Jun 19, 2017