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Ford Motorcraft OEM Spark Plugs (99-01 Cobra; 03-04 Mach 1)

Item 52919
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Direct OEM Replacement
      • Copper Core with Iridium Tip
      • Motorcraft Part# SP-433
      • Fits 99-01 Cobra and 03-04 Mach 1 Mustangs
      • Sold as a Set of 8


      Routine Maintenance. It is recommended to replace your old spark plugs every 30,000 to 45,000 miles as part of your Mustangs routine maintenance. Old, fouled, or damaged spark plugs can rob your Mustang of power and fuel efficiency, so replace them with a brand new set of genuine Ford Motorcraft OEM Spark Plugs to regain your pony's lost power.

      OEM Quality Materials. Ford Motorcraft Spark Plugs feature a copper core for its superior electricity conductivity and a durable iridium tip to assure a strong spark to keep your stang running at it's peak efficiency.

      Fitment. This set of eight (8) Ford Motorcraft OEM Spark Plugs are specifically designed as a direct fit replacement for the 1999 to 2001 SVT Cobra and 2003 to 2004 Mach 1 Mustangs equipped with a 4.6 DOHC V8.

      Fitment: 1999 2000 2001 2003 2004 Details

      MPN# SP-433

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (15)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 15 customers

      Installation Time: Less than 1 Hour

      • September 12, 2019

        5 1999 Cobra - Spentastic Installation Time: Afternoon

        Ford Spark Plugs

        Replaced plugs on my 99 Cobra with 50k miles. Preferred to go with ford plugs and wasn’t disappointed.

        Helpful (0)
      • July 27, 2019

        5 2003 Mach 1 - thatdaviddude Installation Time: Less than 1 Hour

        OEM plugs

        No real performance gain when you stick with OEM plugs other than gaining back what was lost over time. That being said I put these in with new Ford Performance coils and a new OEM fuel filter and the difference was night and day.

        Helpful (0)
      • April 19, 2018

        5 2004 Mach 1 - TomD Installation Time: Less than 1 Hour

        Work great

        These ford oem spark plugs work great in my 2004 Mach 1, perfect fit easy to install

        Helpful (5)
      • November 08, 2017

        5 2003 Mach 1 - MichaelD Installation Time: Afternoon

        Great Choice!

        As we all do - I fretted and debated the decision - which plug to use in my Mach 1. Aftermarket - or OEM? After much thought - went with the OEM. These are great plugs - and the car runs much smoother, has regained lost power and mileage. No regrets with these - and I'm set for many more miles!

        Helpful (5)
      • June 21, 2017

        5 2001 Cobra - Buck Installation Time: Less than 1 Hour

        Just what I wanted

        Was due for new plugs and Wanted to go with oem motorcraft plugs since my motor is stock with bolt ons. More then anything I wanted to do preventative maintenance. Make sure to gap your plugs to spec. Only thing I notice is my car idles a hair smoother. Old plugs where still in pretty good shape. American muscle makes getting my mustang parts convenient and easy as always, and these customer review's on the products gives you confidence on what to purchase for your set up, and know what to expect. I recommended going with oem plugs unless on the bottle or boost.

        Helpful (6)
      • October 25, 2016

        5 2003 Mach 1 - Ale Installation Time: Less than 1 Hour

        Runs like a charm

        Had a slight misfire but once these got put in my mach 1 runs great again

        Helpful (6)
      • July 18, 2014

        5 2004 Mach 1 - 04TorchRedMach1 Installation Time: Afternoon

        OEM Spark Plugs

        Decided to stick with the OEM Ford Motorcraft spark plugs due to never having an issue and you can go wrong with OEM parts. Install was a breeze and no to difficult to install. Just take your time and you will encounter no issues like i did. Definitely recommend for you stock stang.

        Helpful (6)
      • January 18, 2013

        5 2003 Mach 1 - Jordieflex Installation Time: Less than 1 Hour

        Great product!

        I was very satisfied with this product. OEM motorcraft is the best way to go. Great price, way cheaper than the dealer.

        Helpful (6)
      • July 02, 2012

        5 2004 Mach 1 - Vegasmach1 Installation Time: Less than 1 Hour

        Stock plugs

        These stock plugs worked great on my car..idles smooth and keeps my Mach 1 running at full force..highly recommend others to buy this product..

        Helpful (6)
      • March 24, 2012

        5 2003 Mach 1 - rudscuba Installation Time: Afternoon

        Spark plugs DOHC installation tips

        My vehicle is a 2003 Mach 1 with 30,000km. I have the basic bolt ons for max performance. JLT Ram air, twin 65mm BBK throttle body, Magna flo exhaust with -X pipe, SCT programmer from Bama,I also have the 80,000v coils from Weapon X, and I had purchased their plugs too. All this basically happened to the car around 25,000kms. Those plugs or any plugs just do not last with those coils, the coils do make a difference but at the price of plugs, so with that said you may as well burn up the stock plugs at $3 a plug as opposed to $10 plugs they last as long. Also before removing the plug have your engine cold (alluminum heads) and use your compressor and blow out the hole little rocks and sand can and do get trapped in there. When installing the new plug put some nickle anti seize on the threads and do not over tighten snug them up and 1/8 turn to tighten no more.

        Helpful (10)

      Questions & Answers (3 answers)

      3 Top Rated Questions

      What is the heat range for these? I'm looking at spraying my 4v and was told i needed a 1 step colder plug. Thx

      • The Ford Motorcraft OEM Spark Plugs are manufacturer heat range 3

      Helpful (1)

      accidentally ordered these for my 2000 gt v8 4.6 sohc will they still work for that rig?

      • Unfortunately, these will not work with a 2000 GT and are designed to work with only the 99-01 Cobra's and 03-04 Mach 1 models. Please reach out directly to our customer service department either by chatting in with our live support team or by giving us a call at 1-877-887-1105. We are open every day at 8:30AM EST until11:00PM EST.

      Helpful (0)

      Will the sp-433 ford motorcraft spark plugs work on my 2005 v6 ford mustang

      • These Ford Motorcraft OEM Spark Plugs would not work with your 2005 V6 Mustang. To stick with Ford Motorcraft spark plugs, you would want to look for the SP498 plugs, which we do not offer at this time

      Helpful (0)
      Post Your Question

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (8) Spark Plugs

      Tech Specs

      Will It Fit My Mustang

      • Cobra - 99, 00, 01
      • Mach 1 - 03, 04

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