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NGK Iridium IX Performance Spark Plugs (79-82 5.0L; 87-93 5.0L; 94-95 GT)

13 Reviews
Our Price

$69.99

(set of 8)
  • Item #64005
  • MPN# 7559

  • Market Price $79.99
  • You Save 13% ($10.00)
In Stock Ships same business day.
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Customer Photos
Features
  • Iridium tip for a constant stable spark
  • Improves fuel economy and lower emissions
  • Heat Range: 4
  • NGK part# 7559
  • Fits 79-82 5.0, 87-93 5.0 LX/GT, and 94-95 GT
  • Sold as a set of 8
Description
High Performance. Keeping your Mustangs high performance engine running smoothly and efficiently is important, so routinely replace your old weak plugs with a new set of NGK Iridium IX Performance Spark Plugs for constant reliable spark power. The Iridium IX plugs from NGK will provide improved throttle response, fuel efficiency, lower emissions, and will reduce fouling.

Superior Materials. NGK Iridium IX Performance Spark Plugs feature a copper core electrode for its superior conductivity and an iridium tip (which is 6X harder than platinum) for it's extremely high melting point, perfect for keeping your Mustangs high-performance engine running at it's peak. And as an added bonus the Iridium IX plug features Trivalent Metal Plating for it's superior anti-corrosion and anti-seizing properties.

Application. This set of eight (8) NGK Iridium IX Performance Spark Plugs are specifically designed as a direct fit replacement for the 1979-1982 5.0 V8, 1987-1993 5.0 LX/GT, and the 1994-1995 GT Mustangs equipped with the 5.0 liter V8.

Fitment: 1979 1980 1981 1982 1987 1988 1989 1990 1991 1992 1993 1994 1995 Details

Won't fit? Add an exception

What's in the Box
  • (8) Spark Plugs
Installation Info
Will it fit my Mustang?
  • Foxbody - 79, 80, 81, 82, 87, 88, 89, 90, 91, 92, 93
  • GT - 94, 95

Fits 5.0L V8's Only

Most Helpful Reviews

5/5
Great!!!

when i put these plugs in my 5.0 Cobra they fired up like and bat out of hell!! They work well with k&n filter and flowmasters, I can feel it breathing better probably added a couple of horses ill know ...

Read More
Helpful (4)

5/5
NGK Iridium plugs

The plugs work great. Great engine start and car feels a little more responsive.

Helpful (4)

Read All 13 Reviews
Overall Rating 5 out of 5 stars

Customer Photos (2) View All Photos

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3 Questions / 10 Answers

Ask a Question

Spark Plug Gap? Are the plugs already gapped or will i need to gap them?

Vaughan Year: 1995 Model: GT

  • all plugs come from the factory pre-gapped... be sure to put anti-seze on all the plugs....

    Best Answer

    nhrad1 Year: 2007 Model: Other Top 250 Contributor

    Good Answer (1)

Show 3 more answers Question Resolved

Anti-seize, yes or no? Should I use anti-seize with these or not and which one do you recommend?

JB94302 Year: 1994 Model: GT

  • According to NGK, "the use of anti-seize compounds on spark plug threads that have a metal shell plating (i.e. Zinc or Nickel plating) may allow the installer to mistakenly over-tighten the spark plug". To answer your question, skip the anti-seize. You'll be fine. NGK's plating is already designed to prevent corrosion and seizure.

    S197inthe208 Year: 2007 Model: V6

    Good Answer (0)

Show 4 more answers Question Resolved

does anyone know that gap size they come in i know tthey come pregapped

stevie46 Year: 1996 Model: V6

  • i do not know what they come as but any plugs that you get pre gapped or not could have changed during shipping. so i would gap them again before installing them.

    Fuxbudy Year: 1992 Model: GT Top 1000 Contributor

    Good Answer (0)

Question Resolved

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Customer Reviews (13) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Afternoon

Installation Cost:0-$100

  • Performance Gain 4.75 4.8
  • Fit 4.875 4.9
  • Bang For Your Buck 4.625 4.6



  • 5/5

    February 27, 2010

    Great!!!

    when i put these plugs in my 5.0 Cobra they fired up like and bat out of hell!! They work well with k&n filter and flowmasters, I can feel it breathing better probably added a couple of horses ill know for sure when i put it on the dyno. great product good discount

    james johnson

    Helpful (4) (0)

  • 5/5

    October 14, 2010

    NGK Iridium plugs

    The plugs work great. Great engine start and car feels a little more responsive.

    Carl Chambers

    Driving Style: Daily Driver

    Helpful (4) (2)

  • 5/5

    Installation Time: Afternoon

    October 20, 2012

    pow

    i like these plugs and the fit is a lot better then the ones i had before. also the only reason it looks over 2 house to do these plugs was #1 my old plugs were stuck and had to be forced out #2 cylinder number 4 (back, left plug) was a pain because of the angle of my header.

    Top 1000 Contributor

    Fuxbudy

    Year: 1992 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Maryland, USA

    Helpful (1) (0)

  • 5/5

    April 15, 2010

    NGK Iridium IX Spark Plugs

    These plugs are the jimmy jam. My pony is runnin so smooth now. I could instantly feel the difference from the time I started it up. Super responsive plugs. A++ in my book! Thanks AM

    Hessler

    Helpful (2) (1)

  • 5/5

    Installation Time: Afternoon

    June 29, 2012

    NGK all the way!

    Man, they made my 'stang sound like it had a whole different mill in it! It's got more pop to it everytime it fires!

    Loganator

    Year: 1991 Model: Other Driving Style: Street / Strip 'Stangs I have owned: 1 Orange, TX, USA

    Helpful (0) (1)

  • 5/5

    April 08, 2010

    Ing.

    excellent

    Hiram Maldonado

    Helpful (1) (2)

  • 5/5

    October 14, 2010

    NGK Iridium IX Performance Spark Plugs 5.0

    a true love hate relation ship, they work great but after racing around they like to sputter at low rpm's, but works a lot better then stock!

    cody K

    Driving Style: Daily Driver

    Helpful (1) (4)

  • 5/5

    Installation Time: Afternoon

    January 04, 2014

    NGK spark plugs

    Great plug! Good performance upgrade. Works great with my upgraded ignition system!

    MikeSN95

    Year: 1994 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Hilton Head Island, SC, USA

    Helpful (0) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    May 07, 2013

    Great Set of Plugs

    My 88 was having trouble keeping its power in the higher rpms until I installed these sparkplugs and man what a difference! The idle is a lot smoother and it burns a lot cleaner. You can even hear the difference when you accelerate. Defiantly worth it.

    Mkdnk

    Year: 1988 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Stuart, FL

    Helpful (0) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    November 24, 2012

    made a huge difference.

    I changed out my whole system. These are a great addition. My old plugs were looking worn and with shorty headers I wanted to prolong the life of my plugs. I could feel a difference after the install and you will too.

    RyanAM12

    Year: 1994 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Malvern, PA

    Helpful (0) (0)

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