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boared and stroked flathead

Discussion in 'The Hokey Ass Message Board' started by Chopped&Dropped, May 26, 2010.

  1. Chopped&Dropped
    Joined: Apr 8, 2008
    Posts: 54

    from Salt City

    Hey fellas I have a question about a boared and stroked flathead. It has a 4" merc crank and bored .060. When we pulled the heads off there were two head gaskets. When we tried to put it back together with one the piston is touching the head there is not enough clearance. Have any of you heard of putting two gaskets for clearance or is that a bad idea. Any info is appreciated
  2. Da Tinman
    Joined: Dec 29, 2005
    Posts: 4,226

    Da Tinman

    Not the best solution, but it works and has been done many times before.
  3. you could run a spacer plate instead of two gaskets.
  4. smiffy6four
    Joined: Apr 12, 2010
    Posts: 333


    But wouldn't that need 2 gaskets anyway?

    BTW, was your engine attacked by a wild pig(boared)?:D
    Sorry, can't help it!:D
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  5. Mike51Merc
    Joined: Dec 5, 2008
    Posts: 3,789


    Sounds like either "pop-up" pistons were installed, or the heads were shaved a wee bit too much.

    Or, maybe because the cylinders were boared instead of bored.

  6. the spacer plate acts as the head gasket, use a sealer like holimar on both surfaces
  7. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,683

    Bruce Lancaster
    Member Emeritus

    Likeliest thing is that the rebuilder used Ford pistons for a 3 3/4 stroke. Two gaskets and a little slop in the specs would add up to about what you have.

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