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Old 01-16-2012, 08:39 AM
96999153E4OD 96999153E4OD is offline
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How do I plug the smog ports from the air tube in the head

Hello all,

I've got a 1996 F150 with the 4.9L six, and the air/thermactor tube that goes into the head is making a loud noise, and I want to get rid of it. I'm in Arkansas, so no emissions testing, and the cat was removed by the previous owner. I was wondering what size bolts I need to plug the ports in the head. Will straight thread bolts work, or do I need taper threaded fittings? Oh, and if anyone has done this before, please chime in on how you did it, and how it worked out. Some pictures would be great.

Thank you very much in advance.
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Old 01-17-2012, 09:46 AM
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Prof2113 Prof2113 is offline
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I have the same truck and engine. I have emissions testing here, so not doing this for another 9 years, but this is what I would do.

1. Find fittings in brass or steel that are the same thread if possible. Haven't looked, so not sure if you could find them at the local hardware store.

2. Remove the assembly and cut the smaller tubes off at the main tube. Then crimp and fold the tubes over and then weld or braise them shut. Then screw them back in the head.

Since I have replaced my tube already, a few tips.....

You really want to use a line wrench for this job. The fittings are thin and will flex when loosening. If you use a line wrench, it helps combat that problem as well as rounding off the fittings. I sprayed copious amounts of wd40 on the fittings before removing and let them set over night. They came out without a problem.

If you are going with option 2 and you destroy a fitting, they are available as a set from pciinc.com at a reasonable price. I got the tube and all fittings for about $100. I think the fittings as a set are about $40.

Good luck and let me know how it goes.
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Old 08-14-2014, 05:07 PM
chaseford chaseford is offline
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Hello good people anyone know where i can find a smog tube for 1995 f250 4.9 i can be reached at chaserock606@gmail.com or 215 457-4377
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Old 08-15-2014, 10:20 PM
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I got the tube and fittings a couple years back from pciinc for about $100. I looked them up online. Be sure and ask if they have a local dealer.
I also have ordered one from Summit. Not sure if they still have them. Be sure and get new fittings, though.

Good luck!
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Old 08-15-2014, 11:16 PM
RTSinDallas RTSinDallas is offline
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2. Remove the assembly and cut the smaller tubes off at the main tube. Then crimp and fold the tubes over and then weld or braise them shut. Then screw them back in the head.

This is what I did, weld them shut, it worked great. I ground the weld flat and they look fine. Brazing/sweating would work as well, maybe even JB weld or some high temp goop of choice.
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Old 08-17-2014, 01:27 AM
raven3 raven3 is offline
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Soak the fittings with " liquid wrench". Engineering studies have proved that this product works better than all the others.
Alternate is 50% acetone and 50% automatic transmission fluid.

Remove the tube fittings and manifold.

I used 3/8"-20 x 1/2" long steel black oxide set screws with allen sockets with the high temperature permatex thread sealer.
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Old 08-17-2014, 12:21 PM
chaseford chaseford is offline
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Thankyou for the feed back on my post

Hello good people i'm still working on this 95 f250 i thought i had a choice
with smog air tube finding tube or closing ports but friend wants me keep on lookin for tube .So if anyone knows where i can get this flipping tube i still can use the info. Thanks .
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Old 08-26-2014, 08:58 AM
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Brigart Brigart is offline
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forget exactly what size they were, but i took one removed tube nut down to fastenall and bought 6 bolts. Installed with loc tite. Doesnt look the best but it worked.
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Old 08-26-2014, 08:58 AM
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