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Flathead Spark Plug Help (Raise a plug?)

Discussion in 'The Hokey Ass Message Board' started by Sixcarb, Feb 21, 2012.

  1. Sixcarb
    Joined: Mar 5, 2004
    Posts: 1,503

    Sixcarb
    Member
    from North NJ

    Would like to know if anybody has run into this and what your fix has been, I have a set of Flathead aluminum heads that take the larger diameter spark plug, I put the autolite 386 plugs in and mocked everything up and the valve hits the electrode. I need to get the plug raised up, I did try two washers on the plug and it helped but not quite enough, to me it sounds to risky to put 3 washers on. Does anybody know of another plug that may be a bit shorter and would pull the electrode up in the head a bit. Right know i'm about 1/8 to long.
     
  2. Champion makes solid washers for some sizes, check with them.
     
  3. studefreak
    Joined: Mar 16, 2007
    Posts: 187

    studefreak
    Member

    I had the same issue with my weiands . Used a autolite 216 and worked fine
     
  4. 51 MERC-CT
    Joined: Apr 5, 2005
    Posts: 1,595

    51 MERC-CT
    Member

    Doubt that it would work, the 386's are 18MM plugs:)
     
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  5. Sixcarb
    Joined: Mar 5, 2004
    Posts: 1,503

    Sixcarb
    Member
    from North NJ

    Does anybody know if a 18mm to 14mm adapter raises it at all or does it just put the 14mm in the same place. I may buy an adapter and measure it up.
     
  6. terryble
    Joined: Sep 25, 2008
    Posts: 541

    terryble
    Member
    from canada

    A LONG time ago I used 18-14 adaptors in a Knuckle head Harley, they raised the plug enough I used longer reach plugs for a 230 Chevy. Hope the few memory cells I have left are working today. Now can anyone out there tell me where my keys are?
     
  7. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,682

    Bruce Lancaster
    Member Emeritus

    Whatever those adaptors do to height, you'll at least have a larger range of plugs to choose from!
     
  8. 51 MERC-CT
    Joined: Apr 5, 2005
    Posts: 1,595

    51 MERC-CT
    Member

    Looks like they would raise it quite a bit but if necessary could possibly be machined to the exact requirements.
     

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