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Ford Intake Manifold to Head Gasket; Passenger Side (99-04 GT)

Item 383850
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      Product Information

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


      • Intake Manifold to Head Gasket Seal
      • Original Factory Equipment - OE Fit and Finish
      • Genuine Ford OEM Part - YL3Z9439A
      • Right Hand - Passenger Side
      • Sold Individually
      • Fits 1999 to 2004 2V 4.6L GT Mustangs


      Leak Free Performance. Whether you are installing a brand new intake manifold or just re-installing your factory intake, you will need high quality gaskets to prevent power robbing leaks. That is why AmericanMuscle offers brand new genuine Ford replacement gaskets.

      Genuine Ford Part. Made to the original factory specifications from OEM quality materials, this genuine Ford Intake Manifold to Head Gasket is the perfect replacement part for a factory correct installation. Genuine Ford OEM part - YL3Z9439A.

      Application. This genuine Ford Passenger Side Intake Manifold Gasket is designed for use on 1999 to 2004 GT Mustangs equipped with the 4.6L 2V SOHC Modular engine. Sold individually.

      Please Note. This Gasket will not work on the driver side. You'll need part # YL3Z-9439-BA.

      Fitment: 1999 2000 2001 2002 2003 2004 Details

      MPN# YL3Z-9439-A

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (14)

      Write a Review

      Ratings Summary

      4.2 out of 5 overall rating from 14 customers

      • July 12, 2019

        5 2004 GT - Terminator9904

        Best gaskets for 99-04 2Valve mustangs

        Always had a leak with the other gaskets and the professional products gaskets are like printed paper don’t waist money on those get the stock Ford oem gaskets and it seals the manifold 100 no more leaking especially if you want to install the typhoon manifold it took me about 30-40 min to swap everything including manifold

        Helpful (0)
      • April 03, 2019

        1 2002 GT - Mike

        Wrong setup

        If you have a opr after market intake this will not work out 200 dollars on old intake that i purchased from a.m because they dont make seals individualy for the opr intake very upset about this

        Helpful (1)
      • March 12, 2019

        4 2004 GT - Jennifer

        Not bad

        Not bad, could be better. I prefer the metal ones but this will work.

        Helpful (0)
      • January 19, 2019

        5 2001 GT - ChristopherO

        Original manifold cracked..

        Needed these for the replacement intake Manifold I had to replace due to the original cracking.. not one complaint... american muscle has always delivered great parts and customer service when my stang needs it..

        Helpful (2)
      • November 09, 2018

        5 1999 GT - Art

        Replacement intake manifold

        Everything went well took a real lot of time for cleanup

        Helpful (5)
      • September 05, 2018

        5 2002 GT - Tj

        Perfect Fit

        Well i guess this is a common issue with the 4.6 because i had to wait a couple of weeks for the gasket to be re-stocked, but once i received it, i went right to the garage and installed it... it was the perfect fit... Thanks AM, Peaches runs so much better now PS. please order both sides...

        Helpful (5)
      • August 08, 2018

        5 2003 GT - BillM

        1st Class

        Received and installed without any problems. Quality product made the installation of my new intake manifold very easy.

        Helpful (4)
      • July 31, 2018

        5 2000 GT - JeffC

        Good product

        Everything worked as expected now I just need it to last for a while only time will tell but satisfied with my purchase

        Helpful (5)
      • July 09, 2018

        4 2004 GT - wireproof

        Works great and perfect fit

        Works great so far and fits my 2004 GT perfectly! Absolutely expensive, especially as you need two of these (@ $40 a pop) but it's worth it for quality!

        Helpful (6)
      • October 05, 2017

        1 2001 GT - RD911

        Not the correct part for 01.

        Bought this for my wife's 01 when I replaced the intake. It should have two holes in the end for the bolts but only has one. Ended up finding the correct set at Auto shop for 19.99. If you're looking for an 01 don't waste your money this product won't work and is priced too high as well.

        Helpful (12)

      Questions & Answers (7 answers)

      5 Top Rated Questions

      it looks like weak spot between the water outlets and exhaust ports on these gaskets.could this be a hard problem to have another bolt fixed in that spot?

      Will these fit the Professional Products Polished Typhoon Intake Manifold?

      • I would recommend using the Professional Products gasket set with their manifold.  Part number 20055 

      Helpful (0)

      I read the review saying this is the incorrect part for the 2001 Mustang Gt. Has anyone had any luck with this on their 01 GT? Did it fit and stop the leaking? I am looking to buy this soon, so please get back to me as soon as possible...Thanks!

      • This Ford Intake Manifold to Head Gasket will be correct for 2001 Mustangs.

      Helpful (0)

      Will these Ford gaskets work with the Victor Jr. intake?

      • The Ford Intake Manifold to Head Gasket will be compatible with the Edelbrock Victor Jr. EFI Intake Manifold.

      Helpful (0)

      Whats the difference between the passenger and drivers side? Im holding one of each and they appear to be 180* mirror images. Is there something we are missing?

      • The only difference would be the coolant cross over would be different on the passenger side which makes it slightly different then the right side.

      Helpful (0)
      Post Your Question
      2 More Questions
      Is this gasket only for the passenger side only or does this fit on both sides? Is there a part # for the driver side? 1 answer
      Does this also work as the driver side or would I have to buy a different product to replace the driver side too? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Right Hand - Passenger Side Intake Manifold to Head Gasket

      Will It Fit My Mustang

      • GT - 99, 00, 01, 02, 03, 04

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