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Technical Flathead head gasket question about valve clearance

Discussion in 'The Hokey Ass Message Board' started by Diavolo, Dec 24, 2018.

  1. Diavolo
    Joined: Apr 1, 2009
    Posts: 810


    The short story is I am running 1.6 valves in my 8BA, bought the high compression Edelbrock heads.

    Test fit and spun the crank and my exhaust valves are scraping the insides of the heads. I didn't bend any valves but I need to clearance the area around the exhaust valves. Here is my question.

    If I buy Big Bore head gaskets, will I have the extra clearance around the exhaust? The current standard copper gaskets are right next to the cutout for the valves on the head and I don't see how I can clearance that area without leaving some of the head gasket hanging in the combustion chamber. I literally only need about .050 room to get the clearance around the valves.

    Any suggestions would be appreciated.
  2. RICK R 44
    Joined: Dec 13, 2009
    Posts: 455

    RICK R 44

    Have the same setup. There are no locating dowels in the block so the heads can move a bit as there is clearance around the head bolts. Hold the heads and the gasket up as close to the intake as possible and tighten down the head bolts. I would also check the clearance with Plasticine(modeling clay). Use an old head gasket and tighten the heads down. If you don't have enough clearance, take a bit out as req'd with a die grinder.
  3. tubman
    Joined: May 16, 2007
    Posts: 4,975


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