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NGK Iridium IX Spark Plugs (83-85 5.0L)

Item 64017
AmericanMuscle no longer carries the NGK Iridium IX Spark Plugs (83-85 5.0L). Please check out 1979-1993 Foxbody Mustang Spark Plugs & Spark Plug Wires for an updated selection.
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Features & Details

  • Iridium Tip for a Constant Stable Spark
  • Improves Fuel Economy and Lower Emissions
  • Heat Range: 4
  • NGK Part# 7401
  • Fits 1983-1985 5.0L V8 Mustangs
  • 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 1983-1985 Mustangs equipped with the 5.0 liter V8.

Fitment: Details

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (8) Spark Plugs
Installation Info
Tech Specs
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        Customer Reviews (2) Write a Review

        Overall Rating 5

        out of 5 stars

        Installation Time:Afternoon

        • Performance Gain 5 5
        • Fit 5 5

        • 5/5

          Installation Time: Less than 1 Hour

          January 18, 2016

          NGK Iridium IX Performance Spark Plugs

          This spark plugs are def one of the best brands out there. It has made a difference in my Mustang. The install was fairly easy, for those that are new at doing your tune ups I recommend finding a diagram that shows you the sequence numbers of your plug connections. You will need a long socket to change the old spark plugs (I prefer the socket with the magnet for easy pick up) Once your ready to install the NGK Spark plug start by installing one at a time. You can add the special lube on the grooves of the spark plug to prevent any broken spark plugs in the future when replacing them. These spark plugs are the best! Def recommend these they are solid!


          Year: 1985 Submodel: GT Phoenix Az

          Helpful (5)

        • 5/5

          Installation Time: Afternoon

          December 19, 2014

          Major tune up

          I ordered the iridium spark plugs, American racing spark plug wires ,MSD distributor cap and rotor and the MSD coil all at once . The wires were all cut to length and numbered for easy installation .Do one wire and one plug at a time, transferring each plug wire to the new distributor cap . I took my time ,turned the heater and radio on in my garage and i was good to go , probably a couple of hours . I fired that baby up and took it for a ride, all i can say is wooow !!!!!!! Get rrr done !! Thanks America Muscle --- from Canada have a nice day eh .


          Year: 1988 Submodel: Other London, ON, Canada

          Helpful (6)

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