Engine Spark Plugs

Discussion in 'SN95 4.6L Mustang Tech' started by Navyellis, Aug 20, 2013.


  1. Navyellis

    Navyellis New Member

    Joined:
    Aug 19, 2013
    Messages:
    2
    Likes Received:
    0
    Trophy Points:
    2
    Location:
    Lemoore, Ca
    Okay guys, normally I would search around and try and find the answer through the posts but I have the feeling that not too many people have taken a 98GT and put a 3.4L whipple on it...So the question I have is I've been having some hesitation issues between 1400-1600RPM and some breakdown up in the higher RPM ranges ^4000. I'm 98% sure its the plug wires (which are coming in tomorrow) but I've also noticed after installing it I have copper plugs...So should I stick with the coppers, or change up to platnium, or iridium? I'll also be honest, I don't know much about spark plugs at all. If I change up what should I gap them to?
  2. flstang65

    flstang65 Well-Known Member

    Joined:
    Dec 6, 2007
    Messages:
    1,605
    Likes Received:
    130
    Trophy Points:
    64
    Location:
    Clermont, FL
    blower car = copper maybe even get them one heat range colder


    Sponsored Ad

  3. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

    Joined:
    Nov 30, 1999
    Messages:
    6,126
    Likes Received:
    712
    Trophy Points:
    164
    Location:
    Somewhere on a hill in the PA wildnerness
    yes, one heatrange cooler with up to 12 psi, 2 colder for above that
  4. sneaky98gt

    sneaky98gt Mustang Master

    Joined:
    Apr 24, 2008
    Messages:
    3,184
    Likes Received:
    150
    Trophy Points:
    94
    Location:
    NC State University
    NGK TR6 plugs. Gap to .034.

    That's all you need for about 95% of blower cars out there. And the plugs are cheap. $1.59 last time I bought any.

Share This Page