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Holy Pipe Fittings Batman!!!!!

Discussion in 'The Garage' started by BlaKK54Speed, Jan 21, 2007.

  1. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    ok, i took all the EGR stuff off of my 305. there is a pipe that screws into each manifold, i broke one off so it is stuck in there and i lost the pipe out of the one that did come out. now i have a hole in my exhaust and its really loud. What the hell size is this thing!!!!! i think its like a 3/4 compression fitting but i dont know. i think a 7/8 fine thread bolt would work too but the biggest that anyone has is a 3/4. this is really making me mad i have been looking for a plug for days!!!!!!!!!!!!!!!!!!!!!!!!!!
     
  2. goldwing2000

    goldwing2000 Guest

    Throw some steel over it and weld it shut!
     
  3. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    i never thought of that. thats good. i wonder if i could get in there close enough to weld it good
     
  4. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    im seriously thinking about just buying some headers and taking it to a muffler shop and running all new straight to the back!!!
     
  5. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    That's not EGR stuff, that's AIR stuff.

    Geez, I thought it was 1/4" or 3/8". When I pulled my lines off, I used a threaded plug in each hole(I can't remember which size). If you're having a problem threading the old one out, heat it up with a torch first.
     
  6. beater_k20

    beater_k20 Banned

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    the individual pipes are 1/4", but the manifolds with a single pipe i believe are 3/4" pipe plugs.
     
  7. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Hmmm. So GM had two different AIR line configurations?
     
  8. beater_k20

    beater_k20 Banned

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    yes, one with 8 individual pipes, one to each exhaust port. or, one with a centrally located fitting in each manifold for a total of two.
     
  9. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    i tried a 3/4 fine thread and it just slides into the hole. im really lost here
     
  10. beater_k20

    beater_k20 Banned

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    3/4 fine thread pipe fittings? i've never heard of such a thing. :confused:
     
  11. goldwing2000

    goldwing2000 Guest

    3/4 bolt thread and 3/4 pipe thread are two completely different things. Think ID (pipe) vs. OD (bolt). House stuff (pipe) vs. truck stuff (bolt)

    You can go to the hardware store to get some 3/4 inch black pipe but I still say to just weld it.
     
  12. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    i tried a 3/4 bolt. they only make 3/4 and 1/2 pipe plugs and they dont fit. so i went to bolts.
     
  13. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    all pipe fittings are coarse thread, i need fine thread
     
  14. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Cool, I learned something new today!!!:thumb:

    I've never seen the "one pipe" setup. I wonder why GM went with 2 different systems, instead of just choosing one and using it for everything?
     
  15. sandawgk5

    sandawgk5 3/4 ton status

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    I got a pic of it hold on a minute

    Ira
     
  16. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    i prefer the 2 fitting system, cleaner...
     
  17. sandawgk5

    sandawgk5 3/4 ton status

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    Here ya go

    [​IMG]

    From what I can tell this style was on TBI trucks with the Non-serp accesories. It seems like the carburated and serpentine systems had the 8 port style.

    Ira
     
  18. beater_k20

    beater_k20 Banned

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    i've never seen a non-serp belt setup on a tbi truck. :confused:
     
  19. goldwing2000

    goldwing2000 Guest

    Probably not pipe thread, then. Is the thread tapered? \ /
    If it's not, then it's not pipe thread. Probably some crazy flare-fitting thread that GM dreamed up so people wouldn't disable their A.I.R. systems. :D
     
  20. goldwing2000

    goldwing2000 Guest

    I just saw two of them last week. Both 1987 K20s with TBI, both had v-belts on PS and AC and multi-groove on Alt and smog.

    I was told they didn't switch to full serp until later in the year and I've since heard about trucks into the 90s that had the same setup. :dunno:
     

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