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Hei Plugs

Discussion in 'Jeepster Commando and Commando Tech' started by jackdog, Apr 15, 2020.

  1. Apr 15, 2020
    jackdog

    jackdog Member

    Finger Lakes NY
    Joined:
    Jul 16, 2013
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    526
    I'm sure this has been answered before but I can't seem to find it in the archives so here goes. What plugs do you use when switching to a HEI dist. in a 225? Gap?
     
  2. Apr 15, 2020
    DrDanteIII

    DrDanteIII Master Procrastinator

    Milford NJ 08848
    Joined:
    Mar 21, 2007
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    1,516
    When I did the HEI on my CJ, I just kept the standard plugs and opened the gap up to 0.040 in (from 0.035). Its works great
     
  3. Apr 15, 2020
    Focker

    Focker That's a terrible idea...What time? Staff Member

    WA
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    Look at my signature line.
     
  4. Apr 15, 2020
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Aug 10, 2003
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    23,596
    Heat range should not depend on the spark voltage. Same plug, with increased gap. Without a dyno, you can't do any better IMO.
     
  5. Apr 16, 2020
    duffer

    duffer Rodent Power

    Bozeman, MT
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    Sep 17, 2009
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    4,460
    I think the factory spec for most GM HEI systems is 0.045".
     
  6. Apr 17, 2020
    jackdog

    jackdog Member

    Finger Lakes NY
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    Jul 16, 2013
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    526
    Trying to remember the 2 wires that go to the HEI are 12v + and tach?
     
  7. Apr 19, 2020
    oddfirejeeper

    oddfirejeeper Active Member

    Hamilton, MI
    Joined:
    May 5, 2004
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    1,253
    yes 12 volt and tach jackdog. Should be moulded in the plastic stating which one is which. at least mine does
     
  8. Apr 19, 2020
    jackdog

    jackdog Member

    Finger Lakes NY
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    Thanks!
     
  9. Apr 23, 2020
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
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    12,529
    Like Duffer said, I'd open them up to .045" which is common on HEI systems. I've seen them as high at .060" but that's unnecessary for this application.
     
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