Zex Spark Plugs...

Discussion in 'SN95 4.6L Mustang Tech' started by tonys5.0, Nov 5, 2007.


  1. tonys5.0

    tonys5.0 New Member

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    I haven't found any posts on what to gap these zex plugs for running nitrous on an 04 gt. I've seen posts for gapping at .035 and .040 but on much older cars running different systems.
    Anybody using these plugs? Did they come "pre-gapped"? What should I gap them at for running a 75 or 100 shot of nitrous?
  2. mustangman9812

    mustangman9812 Active Member

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    I run 1 stage colder autolites on mine. I gaped mine at .035. My friend with a 5.0 uses them but i dont think there is a need to run "zex" plugs, autolites will do fine.

    Gap them at .035 for any size shot, it is the heat rang you need to adjust for, a 75hp to 100hp shot i would put 2 step colder plugs in
  3. the98stang

    the98stang Active Member

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    You want plugs that are 2 steps colder...I would highly recommend NGK BR7EF's gapped at .035
  4. d98gt

    d98gt Founding Member

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    What's wrong with the 1 step colder? I picked up some NGK tr6s just the other day for $1.59 each from Oreillys :shrug:

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