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Holy Pipe Fittings Batman!!!!!

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BlaKK54Speed

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Dec 14, 2006
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Omaha, NE
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!!!!!!!!!!!!!!!!!!!!!!!!!!
 
i never thought of that. thats good. i wonder if i could get in there close enough to weld it good
 
im seriously thinking about just buying some headers and taking it to a muffler shop and running all new straight to the back!!!
 
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.
 
the individual pipes are 1/4", but the manifolds with a single pipe i believe are 3/4" pipe plugs.
 
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.
 
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.
 
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.
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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?
 
CanmoreK5 said:
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?
Click to expand...

I got a pic of it hold on a minute

Ira
 
Here ya go

14653EGRconndriver.jpg


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
 
BlaKK54Speed said:
all pipe fittings are coarse thread, i need fine thread
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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
 
beater_k20 said:
i've never seen a non-serp belt setup on a tbi truck. :confused:
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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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