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

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$69.99 (set of 8)

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  • Item 64005

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Ship to: Ashburn - 20149
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    Features & Details

    • 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
    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

    MPN# 7559

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    What's in the Box
    • (8) Spark Plugs
    Installation Info
    Tech Specs
    Will it fit my Mustang?

      Customer Photos (3) Submit Your Photo

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        Questions & Answers (9)

        5 Top Rated Questions

        I have a 1994 mustang gt with an e303 cam and gt40 heads. Will they still work great??

        • Yes, these would be a great match for your application.  

        Helpful (0)

        Will these plugs work with the gt40x heads?

        • Yes, these spark plugs would work with the GT40X heads.

        Helpful (0)

        Will these work well for TFS Aluminium heads on a 306 Dart Block pushing a Vortech at 10 PSI?

        • Unfortunately we do not have enough information to determine how these NGK Iridium IX Performance Spark Plugs would work with your setup. Please contact our Customer Service department, or your tuner so that your complete setup can be discussed, and a spark plug recommendation can be made.

        Helpful (0)

        I have a 1992 347 with stock block eldlebrock rpm performer heads will these work and what shoukd the gap setting be.

        • A custom setup such as the one you have may require careful testing and gapping, I would contact a local shop that specializes in performance tuning in order to determine the proper heat range and gap for your application before ordering the NGK Iridium IX Performance Spark Plugs.

        Helpful (0)

        Would these work for a 1985 5.0 Gt convertible?

        • For your 85 GT, you will need the NGK Iridium IX Performance Spark Plugs (83-85 5.0L), item # 64017, (http://www.americanmuscle.com/ngk-sparkplugs-7401.html).

        Helpful (0)
        Post Your Question
        4 More Questions
        What spark plugs would you recommend for my boosted 5.0 running 5-7 pounds and a mild top end and stock bottom 1 answer
        does anyone know that gap size they come in i know tthey come pregapped 1 answer
        Anti-seize, yes or no? Should I use anti-seize with these or not and which one do you recommend? 5 answers
        Spark Plug Gap? Are the plugs already gapped or will i need to gap them? 4 answers

          Customer Reviews (26) Write a Review

          Overall Rating 5

          out of 5 stars

          Installation Time:Afternoon

          Installation Cost:0-$100

          • Performance Gain 4.894737 4.9
          • Fit 4.894737 4.9



          • 5/5

            Installation Time: Less than 1 Hour

            December 02, 2018

            Plugs

            Very nice plugs. Fire rapidly and these are a great addition for your car

            IanB

            Year: 1991 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Afternoon

            September 02, 2018

            Plug Replacement

            Job went smoothly factory plugs in car for last 24 years slowed job a bit they were done. New plugs wires and cap rotor night and day.

            DougH

            Year: 1994 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Less than 1 Hour

            June 30, 2018

            Looks good and works like a champ.

            Was time to do a full tune up on the car. Wanted to upgrade the plugs. These work have no problem.

            ChrisL

            Year: 1992 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            June 03, 2018

            NGK Iridium lX

            Absolutely love the Iridium plugs Would recommend to everyone Great prices

            Al

            Year: 1989 Submodel: LX

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            May 26, 2018

            GREAT PRODUCT

            Sparks really work for foxbody, both in response and power! Felt a difference right away, throttle feels more responsive!

            JohnV

            Year: 1989 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            November 30, 2017

            1994 mustang gt NGK Spark plugs

            NGK performance Plugs work great! Will buy again if needed.

            ThadiusB

            Year: 1994 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Afternoon

            October 16, 2017

            Amazing

            These Sparks really livened my Fox up, both in response and power!

            Armadag

            Year: 1989 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            August 23, 2017

            Great Spark Plugs!

            I replaced my distributor cap and rotor, plug wires, and decided to change the plugs too while I was in there. The plugs I took out weren't bad at all, maybe a few thousand miles on them, but wow my car idles so much better and the engine runs so much smoother in general. You can't go wrong with these NGK iridium plugs I have them in my ranger as well. The difference is night and day

            RyanR

            Year: 1990 Submodel: LX

            Helpful (5)

          • 5/5

            Installation Time: Afternoon

            June 08, 2017

            spark plug

            Very easy to install. Several people will still say go with motorcraft because its what ford takes and I was seconding guessing this product but after installing, I notice a big differents in gas, ignition and so forth. Honestly it was worth the cash.

            RobertO

            Year: 1994 Submodel: GT

            Helpful (7)

          • 5/5

            Installation Time: Less than 1 Hour

            February 25, 2017

            Great buy

            Easy to put in. No need to adjust the gaps for me and it runs smooth what more could you want.

            TristanW

            Year: 1988 Submodel: LX

            Helpful (5)

          • 5/5

            August 17, 2016

            Great plugs!

            Great plugs felt a difference right away, throttle feels more responsive!

            5iveoh

            Year: 1988 Submodel: GT

            Helpful (7)

          • 5/5

            July 10, 2016

            True testimony of the ngk experience

            I had to try these after all the good I've heard about them, and now I'm a true believer. These little guy's made a world of difference in my 95 gt. The idle is so smooth now, the hesitation disappeared and man, I tell you that when I get on it. Lets just say, It's a real go getter again.

            MadMax95

            Year: 1995 Submodel: GT

            Helpful (5)

          • 4/5

            Installation Time: Afternoon

            April 04, 2016

            Best spark plugs

            Excellent plugs and it's definitely worth the money. Installation was a breeze, they thread right in with no problem. My 5.0 fired right up and runs twice as good as what it did before. I can really get into the gas and I can feel the difference from those old plugs that was in there before. I recommend these to anyone trying to bring their 5.0 back to life

            Stang88

            Year: 1988 Submodel: GT

            Helpful (6)

          • 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 Submodel: GT Hilton Head Island, SC, USA

            Helpful (6)

          • 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 Submodel: GT Stuart, FL

            Helpful (5)

          • 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 Submodel: GT Malvern, PA

            Helpful (6)

          • 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.

            Fuxbudy

            Year: 1992 Submodel: GT Maryland, USA

            Helpful (6)

          • 5/5

            Installation Time: Less than 1 Hour

            August 31, 2012

            Saves you gas and better throttle

            I had these cheap auto lite plugs. They were ok. I would get 125 miles to an empty tank. Put these in, car starts better, accelerates better and I get 155 to an empty tank..(93 octane with sct tune) so its worth getting. Shouldn't take more than an hour to out in.

            Bushmaster03

            Year: 1989 Submodel: GT Orlando fl

            Helpful (6)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: 0-$100

            July 02, 2012

            This product gave me back my Mustang

            The performance of my car was greatly improved. I like stepping on it and feeling the gs. Anxious to see if the gas mileage will improve. I think it will just from the way the car is performing.

            Mustangme

            Year: 1995 Submodel: GT New Hampshire

            Helpful (6)

          • 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 Submodel: Other Orange, TX, USA

            Helpful (4)

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