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Doug Thorley Header Exhaust GASKET HELP!!!

Discussion in '1st Gen. Tacomas (1995-2004)' started by j4roe, Mar 13, 2020.

  1. Mar 13, 2020 at 1:40 PM
    #1
    j4roe

    j4roe [OP] Well-Known Member

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    Purchased a used set of DT headers. I can't find any information anywhere on the net about the exact exhaust flange gaskets I need. I've read that you use the stock toyota 3.4 flange gaskets but then I've also read that you use these donut gaskets and I can't find specific information regarding part number.

    Anyone know the exact gasket needed for the DT flange junctions?

    Thanks ladies!
     
  2. Mar 13, 2020 at 1:49 PM
    #2
    billybop90

    billybop90 Well-Known Member

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    j4roe [OP] likes this.
  3. Mar 13, 2020 at 2:01 PM
    #3
    Wyoming09

    Wyoming09 Well-Known Member

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    Donuts at the collectors

    Regular Exhaust gaskets on the ports

    If the head and the headers have the same ports not knowing just what model headers you have.

    Depending on just what headers you have if you can`t find the info on Doug Thorley`s web site a phone call most likely will get your answers
     
    j4roe [OP] likes this.
  4. Mar 13, 2020 at 3:16 PM
    #4
    ChargedSHOTaco

    ChargedSHOTaco Well-Known Member

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    I'd use the included gaskets for the flange connections, and stock coppers at the head.
     
  5. Mar 13, 2020 at 9:57 PM
    #5
    j4roe

    j4roe [OP] Well-Known Member

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    I found out that I do need donut gaskets at the collectors but not sure on size.

    Something like this:

    https://www.amazon.com/Uxcell-a15101200ux0256-Universal-Manifold-Exhaust/dp/B018RSRVY4
     
  6. Mar 13, 2020 at 9:57 PM
    #6
    j4roe

    j4roe [OP] Well-Known Member

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    Got the set used. No gaskets included.
     
  7. Mar 15, 2020 at 7:47 PM
    #7
    1997tacomav6

    1997tacomav6 V6 5sp,RegCab,TRD Supercharger,2"pulley,meth, 660k

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    When I bought mine new I called them directly for fit information and they were very helpful.

    They should tell you what you need instead of guessing
     
    Wyoming09 likes this.
  8. Mar 22, 2020 at 2:58 PM
    #8
    j4roe

    j4roe [OP] Well-Known Member

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    Bump

    Having the hardest time finding these damn donut gaskets. Reached out to DT more than 10 days ago, no response. Went to autozone and they couldn't help me for shit. Measured with a micrometer and it's 2'' ID x 2.75" OD... I see a bunch of 2" ID donut gaskets on Ebay and Amazon but all of them have an OD of 2.5". Am I miscalculating the OD? Or should I just buy one of these 2" ID donut gaskets and see if it fits? Shit is pissing me off LOL.
     
  9. May 31, 2020 at 5:02 PM
    #9
    Brake Weight

    Brake Weight But it hasn't rained in weeks...I'll make it.

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    Ever get it sorted? Go to OReilly's and ask to see their donut gasket collection behind the counter. I have a fleaBay header that uses donut gaskets of similar size and that's what I had to do. I have a few spares but none the same. One is for a Jeep, another a Honda, and one is something Merican. If the header isn't mounted yet, take it in there, too.
     
    Wulf likes this.
  10. May 31, 2020 at 5:05 PM
    #10
    Wulf

    Wulf web wheeler

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    yes
    Go to an exhaust shop they will have what you need.
     
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  11. Jun 1, 2020 at 12:49 PM
    #11
    j4roe

    j4roe [OP] Well-Known Member

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    I guess I forgot to update this thread as I really just update the main build thread. My exhaust guy told me that those do NOT need gaskets. I was in complete shock but the guy is a legend and has been doing custom exhaust for 40 years so wasn't going to argue with him. Got everything installed and sure enough, no leaks. So I guess it's misunderstood that these need gaskets...Not sure.
     
    Wyoming09 likes this.
  12. Jun 1, 2020 at 1:36 PM
    #12
    Wyoming09

    Wyoming09 Well-Known Member

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    As long as it works!! and no leaks!!
     
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  13. Jun 1, 2020 at 2:37 PM
    #13
    1997tacomav6

    1997tacomav6 V6 5sp,RegCab,TRD Supercharger,2"pulley,meth, 660k

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    Probably a ball and socket compression fit type design so you can get a perfect angle fit.
     
    j4roe [OP] likes this.

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