80Z Sparkplug cross threaded.

Discussion in 'Tips 'n' Tricks Topic' started by GBar80Z, Jul 26, 2017.

  1. GBar80Z

    GBar80Z New Member

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    0
    Jun 23, 2017
    I think I cross threaded one of my sparkplugs when I replaced them 20+ years ago when I was a kid and I just discovered it now that I'm starting to restore it. Is my head toast or can I fix the threads some how? Can a machine shop re-tap the threads?
     
  2. 70-camaro

    70-camaro Veteran Member

    853
    69
    Mar 25, 2010
    marietta ohio
    It can be fixed with a heli-coil. It is easy to do with the head off. The machine shop should be able to do this for you.
     
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  3. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

    8,811
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    Nov 4, 2004
    Ringgold, GA
    If the threads aren't in too bad of shape, you may be able to repair with a spark plug thread chaser tool, may even be able to rent it from AutoZone or Advance, etc. Do a Google search, you'll get a lot of info. Otherwise, it's best to go the helicoil route.
     
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  4. Twisted_Metal

    Twisted_Metal Moderator Staff Member Lifetime Gold Member

    25,265
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    Feb 26, 2004
    Bloomington, MN
    Chase it.
    I did that with a plug on my old 305 that I got from a salvage yard in the 80s.
    My son is still using that engine and the cross-threaded plug hole has never caused a problem.

    You just have to be VERY careful you get the plug started in the correct set of threads the next time you change them.
     
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  5. budro6968

    budro6968 Veteran Member

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    Apr 2, 2016
    Jax Florida
    If it is a stock iron head you could find a cheap used one and use it if the threads are too bad.
     
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