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Unread 09-17-2011, 08:41 PM   #1
spottedfrog
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1979 CJ5 
 
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Location: Grand Junction, Colorado
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258 Pacesetter header emissions?

Question for those of you with the Pacesetter header for the 258.
I'm wondering what he thread size is for the emissions ports at the top of each tube?
The OEM thread is some weird size that nobody can track down. and I'm not sure the Pacesetter is the same as OEM.
I want to plug the holes but I cant find any thing that fits.
so thinking I would be smart threaded the out put holes on the OEM bolts so I could just plug those with a set screw or some thing. I went to thread those into the Pacesetter header but They don't feel quite right and I don't want to force them and strip the threads.

so any one know the thread size? or how did you plug the holes?

Thanks.

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Unread 09-17-2011, 10:42 PM   #2
1986cj
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I just measured mine for the stock 82 exhaust manifold and the are 1/2" but I think they are national pipe thread. I can check that in the am with a 1/2" pipe die. I wouldn't think that the header would be different if they didn't give you new bolts to put the air rail back on not that you are going to.
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Unread 09-17-2011, 10:51 PM   #3
spottedfrog
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Quote:
Originally Posted by 1986cj View Post
I just measured mine for the stock 82 exhaust manifold and the are 1/2" but I think they are national pipe thread. I can check that in the am with a 1/2" pipe die. I wouldn't think that the header would be different if they didn't give you new bolts to put the air rail back on not that you are going to.
Thats a negative on the pipe thread. I was pretty sure it was till I tried it. It may be pipe thread but I cant get a pipe plug/bolt the right diameter.
Thanks though
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Unread 09-17-2011, 10:54 PM   #4
stodg73
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I just rebuilt the airtube on mine and the bolts may be either 3/8ths npt or maybe 1/4 npt.
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'79 CJ5, 258 c.i., Carter BBD, T-150, Dana 20, Dana 30, AMC 20, 33x12.50x15, 3" body lift, taking it back to stock, then tearing it apart and putting it back together again!
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Unread 09-17-2011, 10:57 PM   #5
1986cj
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stodg73, Where in Colorado are you?
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Unread 09-17-2011, 11:06 PM   #6
stodg73
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Trinidad
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'79 CJ5, 258 c.i., Carter BBD, T-150, Dana 20, Dana 30, AMC 20, 33x12.50x15, 3" body lift, taking it back to stock, then tearing it apart and putting it back together again!
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Unread 09-17-2011, 11:10 PM   #7
stodg73
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Are you looking for the thread pitch on the 5/8ths bolt above the red spray tube?
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'79 CJ5, 258 c.i., Carter BBD, T-150, Dana 20, Dana 30, AMC 20, 33x12.50x15, 3" body lift, taking it back to stock, then tearing it apart and putting it back together again!
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Unread 09-17-2011, 11:11 PM   #8
spottedfrog
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Yup that's the one. I need to plug the hole.
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Unread 09-17-2011, 11:13 PM   #9
1986cj
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Sometime if you would look on your diverter valve can you tell were the smaller line (vacuum sensing inlet) were does the vacum line go on yours.
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Unread 09-18-2011, 07:08 AM   #10
stodg73
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In this pic, you can see where the vacuum line goes.
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'79 CJ5, 258 c.i., Carter BBD, T-150, Dana 20, Dana 30, AMC 20, 33x12.50x15, 3" body lift, taking it back to stock, then tearing it apart and putting it back together again!
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Unread 09-18-2011, 09:45 PM   #11
spottedfrog
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Take this AMC tamper proof emission bolts!



I tapped the existing hole for a 1/4-10 screw then put two set screw in, one from either side. I didn't trust lock tight to hold a single screw in with the heat it'll be exposed to.
And the beauty of this setup is that it is totally reversible should I ever need to.
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Unread 09-18-2011, 09:49 PM   #12
shortgoroper
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Put the 1/2 bolts in and started cranking until they cross threaded and stopped.. then took the plasma cutter and made a nice cut across... good ole rust set in and now it looks like they were meant to be there.
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