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Emission stuff

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javelinman74 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote javelinman74 Quote  Post ReplyReply Direct Link To This Post Topic: Emission stuff
    Posted: Apr/20/2017 at 11:54am
Cannot find my previous post, so again wondering IF anyone has found bolts to use as plugs when removing the air tubes from the exhaust manifold?  Local big hardware had nothing?!?  YEARS back I bought some for my 74 Javelin, but trying to figure out how to plug those holes.
Also the air tube on the 77 Pacer is brazed and I'll get picts later today.  Thanks for any ideas.
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FSJunkie View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FSJunkie Quote  Post ReplyReply Direct Link To This Post Posted: Apr/20/2017 at 4:27pm
The new aftermarket manifolds come with pipe thread plugs.
'66 Marlin: 327/T10/3.54 Twin Grip
'72 Wagoneer: 360/TH400/3.31
'73 Ambassador: 360/TF727/3.15
'77 Hornet: 232/TF904/2.73
'84 Eagle: 258/TF904/2.73
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tyrodtom View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tyrodtom Quote  Post ReplyReply Direct Link To This Post Posted: Apr/20/2017 at 4:50pm
I don't know how many engines are like this,  but on my 360,  they were the same as my spark plugs.

If you really want to confuse someone, just install old spark plugs, and wire them up.
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scott View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote scott Quote  Post ReplyReply Direct Link To This Post Posted: Apr/20/2017 at 4:59pm
On my AM V8 they were a 9/16" bolt, I forget the thread count. They were hard to find, I finally got some at a local small old school hardware store. Like Tom says, spark plugs thread in too.
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FSJunkie View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FSJunkie Quote  Post ReplyReply Direct Link To This Post Posted: Apr/20/2017 at 11:52pm
V8 are 6/16-UNC. Helps to put a copper washer under them.

Six cylinder are smaller, but also fine thread. 7/16-UNC maybe? They don't really have the boss around the bolt hole that the V8s do though, so sealing them with a gasket washer doesn't work very well. That's why I suggested a pipe thread plug.
'66 Marlin: 327/T10/3.54 Twin Grip
'72 Wagoneer: 360/TH400/3.31
'73 Ambassador: 360/TF727/3.15
'77 Hornet: 232/TF904/2.73
'84 Eagle: 258/TF904/2.73
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DaemonForce Quote  Post ReplyReply Direct Link To This Post Posted: Apr/21/2017 at 1:17am
You're talking about the AIR injection manifolds, right? Don't bother looking for it. Just order a drain plug for a 1964 J-100. Should be Dorman 65231.
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Lyle View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lyle Quote  Post ReplyReply Direct Link To This Post Posted: Apr/21/2017 at 8:55am
1/4" socket head pipe plugs with copper washers:
https://www.fastenal.com/products/details/24133
This is for most manifolds. I did find a Jeep that needed 1/8" pipe plugs.
These go on flush with the boss and look better then a bolt and washers, my opinion.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 6PakBee Quote  Post ReplyReply Direct Link To This Post Posted: Apr/21/2017 at 9:40am
Richard, I'm still interested in your smog tubes if you can post a pic.  Big smile
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uncljohn View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote uncljohn Quote  Post ReplyReply Direct Link To This Post Posted: Apr/21/2017 at 10:39pm
It seems to me the last exhaust manifold I plugged used Pip fittings, small ones and they were the correct thread. But it was an Eagle Exhaust pipe.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amcfool1 Quote  Post ReplyReply Direct Link To This Post Posted: Apr/22/2017 at 7:45am
yup, V8 is 9/16-18, six is 1/4" pipe, thanks, gz
ps, if you ever need to get 'em out again, use copper antiseize when installing!
george z
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