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Technical Valve clearance issue on 8ba

Discussion in 'Traditional Hot Rods' started by Hallingdal, Sep 12, 2019.

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  1. Hallingdal
    Joined: Oct 30, 2015
    Posts: 3

    Hallingdal

    Hi all
    I'm having a issue with the valve/spark plug distance my 8 ba engine
    I Have Isky 814000 400 jr. camshaft
    and the 304 C. I. Rotating assembly.

    I also bougt edelbrock 1115 heads but the valves hit the spark plug.
    Not a good choice as I can clearly see now
    So my quistion is what head is best for my engine, edelbrock 1116 or offenhauser 1069 or any other that fits the engine without any further modifications.
    I'm planning to use the engine in a 31 coupe that I'm building.
    I'm living in Norway so it's not many people around to ask about flathead building.
    Regards Håvard
     
    Last edited: Sep 12, 2019
  2. ROADSTER1927
    Joined: Feb 14, 2009
    Posts: 3,127

    ROADSTER1927
    Member

    Put thicker head gaskets on or you could add an extra spark plug gasket to each plug.
     
  3. Hallingdal
    Joined: Oct 30, 2015
    Posts: 3

    Hallingdal

    I was thinking of doing that but I'm not sure what compression ratio I will end up with due to the difference in the size of the combustion Chambers 64 vs 74 on the other heads
     
  4. alchemy
    Joined: Sep 27, 2002
    Posts: 20,407

    alchemy
    Member

    Shorter plug. I started out with Champion H10 in mine until I found a few with the tip flattened. Now I use NGK or Autolites.
     

  5. Mike VV
    Joined: Sep 28, 2010
    Posts: 3,029

    Mike VV
    Member
    from SoCal

    Does the "body" / threads of the spark plug actually protrude through the head into the chamber area ?
    In any case, yes, thick copper washers under the plugs, and or short reach plugs.
    See Summit or Jegs.

    Mike
     
  6. I had the same issue with cast iron heads
    After the block was decked. Solved it with thicker copper head gaskets and NGK plugs.

    Sent from my SM-J727V using The H.A.M.B. mobile app
     

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