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05-30-2017, 10:06 PM
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#1 |
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Registered User
Join Date: Aug 2008
Location: greensboro nc
Posts: 673
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manifold plugs
Anyone know what the thread for holes in stock manifolds where smog crap tubes use to be is. Mine have been plugged,o how I blew one out and need to plug it. 7/16 coarse threads into it,1/4 pipe will not.Has to be similar to pipe to seal off. Have loys of odd stuff laying around,nothing fits perfectly. other plugs do not want to be removed.
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Only the stupid know too much to learn something new. |
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05-30-2017, 11:28 PM
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#2 |
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Post Whore
  
Join Date: May 2015
Location: Alabama
Posts: 14,607
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Re: manifold plugs
If you can't figure it out just drill and tap it to npt and put a plug in it..
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05-30-2017, 11:30 PM
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#3 |
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60-66 Nut
 Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,246
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Re: manifold plugs
I do not know for sure what the thread diameter and pitch is, but it seems to me they are something odd ball. That is why most people cut the ends off of the smog tubes and either crimp them or weld them shut and reinstall them to plug the holes in the manifolds.
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05-31-2017, 12:05 AM
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#4 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,529
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Re: manifold plugs
I've used inverted flare plugs to replace them.
Here's an example. https://www.pepboys.com/product/details/5013553/01036 |
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05-31-2017, 08:20 AM
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#5 |
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Registered User
Join Date: Aug 2008
Location: greensboro nc
Posts: 673
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Re: manifold plugs
Will look for inverted flare first.If not then pulling,drilling and tapping. If so doing all four since manifold will alreadt be on Bridgeport and almost new tapmatic will be in service,not lazy but not stupid.If possible let electric do the hard work.LOL
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05-31-2017, 08:25 AM
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#6 |
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Registered User
Join Date: Aug 2008
Location: greensboro nc
Posts: 673
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Re: manifold plugs
Heck spent 3 hours grinding the stupid humps out that GM had inside manifolds since can't change to headers because new 4l80e need computer before can install and have to do trans to make headers work. Clutch linakge in the way. Should have been born rich instead of great looking,brillant and modest.
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05-31-2017, 08:41 AM
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#7 |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: manifold plugs
I don't know if they differ between manifolds but I have one in my garage and checked the size with a thread chaser. It is 1/2 - 13NC.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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05-31-2017, 09:11 AM
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#8 |
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Registered User
Join Date: Aug 2008
Location: greensboro nc
Posts: 673
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Re: manifold plugs
Must be different ones.
My bad should have stated.These are off mid 70's bbc. My grinding may have loosened old one. Then why would anyone cast a manifold with those huge flow killing humps in them, as if manifolds don't suck flow wise to start with.
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05-31-2017, 02:01 PM
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#9 |
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Registered User
Join Date: Feb 2012
Location: pleasant valley--placerville ca
Posts: 3,039
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Re: manifold plugs
Don't know what years but the early ones were an odd ball thread.
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05-31-2017, 02:33 PM
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#10 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,607
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Re: manifold plugs
"Heck spent 3 hours grinding the stupid humps out that GM had inside manifolds since can't change to headers because new 4l80e need computer before can install and have to do trans to make headers work. Clutch linakge in the way"
Clutch linkage? 4l80e? |
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05-31-2017, 05:11 PM
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#11 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,424
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Re: manifold plugs
You want a tubing plug. Most auto part and hardware stores will have them
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05-31-2017, 08:19 PM
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#12 | |
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Registered User
Join Date: Aug 2008
Location: greensboro nc
Posts: 673
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Re: manifold plugs
Quote:
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05-31-2017, 08:20 PM
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#13 |
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Registered User
Join Date: Aug 2008
Location: greensboro nc
Posts: 673
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Re: manifold plugs
1/4 np and Vaseline got hole tapped and plugged
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