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Old 06-08-2009, 08:54 PM   #1
83hurstguy
 
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Default AIR injection plugs

What is the correct thread on these things?

It's not 1/4" NPT, they only go in two turns and don't match up to the air tubes either. 1/2" fine thread also doesn't work...

Confused, and I need plugs ASAP. Thanks.
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Old 06-08-2009, 08:58 PM   #2
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Default Re: AIR injection plugs

They're tapered if that helps...
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Old 06-08-2009, 08:59 PM   #3
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Default Re: AIR injection plugs

It's either 1/4" or 3/8" NPT. If you can wait til tommorow evening I have extra's in the garage from when I plugged mine, then I can tell you the size indefinatly.
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Old 06-08-2009, 10:16 PM   #4
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Default Re: AIR injection plugs

I used 1/4" NPT in my 5A heads and they worked fine. Wether or not they were the 'correct' threading I don't know.

I have a set of 8 brass plugs from Year One ( used to plug the A.I.R. holes ) that I've never ended up using. They're still in the ziplock bag they came in. If your interested in them, PM me.
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Botched Olds 350 build by the crooks at Rocket Racing. Lunati 207/213 Voodoo cam, 8.1:1 CR ( was supposed to be 8.8:1 ), Stock #7 heads ( was charged for work that was never done and what was done was done wrong ), American Racing headers, Performer RPM intake, Qjet with 1/2" 4 hole spacer, 2.5" Pypes X-pipe system, cowl induction scoop.

Engine never ran the way it was supposed to from day one due to Rocket Racing's negligence. John Stolpa refuses to contact me about it.
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Old 06-09-2009, 06:11 AM   #5
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Default Re: AIR injection plugs

The A.I.R. ports are NOT tapered thread (though you can force anything). They are straight thread inverted flare nuts. The seal is the flare at the end of the A.I.R. pipes. Dorman Products sells the correct plugs.



5/16":

https://www.dormanproducts.com/cgi-b...gory_lis t=:0

3/8":

https://www.dormanproducts.com/cgi-b...gory_lis t=:0
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Old 06-09-2009, 06:15 AM   #6
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Default Re: AIR injection plugs

thanks, Joe. I figured the inverted flare thread was different.
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Old 06-09-2009, 07:16 AM   #7
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Default Re: AIR injection plugs

Didn't want to use the AIR plugs themselves?
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Old 06-09-2009, 07:27 AM   #8
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Default Re: AIR injection plugs

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Originally Posted by DukeDKT442 View Post
Didn't want to use the AIR plugs themselves?
huh?
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Old 06-09-2009, 07:58 AM   #9
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Default Re: AIR injection plugs

With the tubes attached.
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Old 06-09-2009, 08:11 AM   #10
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Default Re: AIR injection plugs

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Originally Posted by DukeDKT442 View Post
With the tubes attached.
gotcha Nah, I think I can live with those in a box in the attic. I mean, granted, they add like 10 hp and the cool factor is unbelievable... but you gotta make some sacrifices, ya know?
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Old 06-09-2009, 08:15 AM   #11
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Default Re: AIR injection plugs

Quote:
Originally Posted by 83hurstguy View Post
gotcha Nah, I think I can live with those in a box in the attic. I mean, granted, they add like 10 hp and the cool factor is unbelievable... but you gotta make some sacrifices, ya know?
Facepalm my project....

Very interested to hear how yours runs... hurry up and fire it up already!
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Old 06-09-2009, 03:11 PM   #12
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Default Re: AIR injection plugs

Sorry "inverted" was what I meant, not tapered.
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Old 06-09-2009, 04:49 PM   #13
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Default Re: AIR injection plugs

My factory plugged 81 307 had a protrusion on the end of each plug. I had grind them down due to carbon on the replacement 307 which had air. Regular NPT thread as said.
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Old 06-09-2009, 08:13 PM   #14
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Default Re: AIR injection plugs

I used 1/4 NPT plugs on the firebird. They were really tight after a turn or two like yours, but i had to get them in because thats all i had, it was a bitch but they went
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Old 06-10-2009, 06:19 AM   #15
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Default Re: AIR injection plugs

Quote:
Originally Posted by Seanmay1 View Post
I used 1/4 NPT plugs on the firebird. They were really tight after a turn or two like yours, but i had to get them in because thats all i had, it was a bitch but they went
And as I said, given a big enough hammer...

Quote:
Originally Posted by joe_padavano View Post
The A.I.R. ports are NOT tapered thread (though you can force anything).
Come on guys, when you pull the A.I.R. pipes out of the heads, it's pretty obvious that they are straight thread flare nuts. Would you force pipe thread fittings into your brake lines?
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Old 06-10-2009, 10:51 AM   #16
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Default Re: AIR injection plugs

Quote:
Originally Posted by joe_padavano View Post
Come on guys, when you pull the A.I.R. pipes out of the heads, it's pretty obvious that they are straight thread flare nuts. Would you force pipe thread fittings into your brake lines?
When I deleted my smog pump and needed plugs, everybody told me 1/4NPT plugs is what I needed. A number of past posts on these forums ( and others ) said the exact same thing so that's what I used.

I say this because I'm sure people are just putting in the 1/4NPT plugs because that's what everybody else is using ( successfully ) so they aren't comparing threading between the two. I know I didn't. I just took off the smog pump lines, put in my NPT plugs ( without any forcing ), and everything worked out fine.
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Botched Olds 350 build by the crooks at Rocket Racing. Lunati 207/213 Voodoo cam, 8.1:1 CR ( was supposed to be 8.8:1 ), Stock #7 heads ( was charged for work that was never done and what was done was done wrong ), American Racing headers, Performer RPM intake, Qjet with 1/2" 4 hole spacer, 2.5" Pypes X-pipe system, cowl induction scoop.

Engine never ran the way it was supposed to from day one due to Rocket Racing's negligence. John Stolpa refuses to contact me about it.
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Old 06-10-2009, 02:04 PM   #17
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Default Re: AIR injection plugs

On my 87 1/4" NPT worked perfectly...

Keep in mind that the thread can get really rusty and also keep in mind that parts of the original AIR Pipe can break off and get stuck in the hole... if they are only going in a turn or two something is stuck in there...
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Old 06-10-2009, 02:29 PM   #18
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Default Re: AIR injection plugs

the OEM (NOS) air tubes I have will thread into these heads by hand all the way. Put in 1/4" NPT plug, it goes two turns in and stops.

That's all I can say.

I ordered the correct plugs from rockauto, they'll probably be here tomorrow.
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Old 06-10-2009, 02:35 PM   #19
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Default Re: AIR injection plugs

Quote:
Originally Posted by joe_padavano View Post
And as I said, given a big enough hammer...
I didn't like doing it that way, but thats what i was told i needed. So thats what i bought got home and removed the lines and thats what had to go in the hole so i could drive the car.
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Old 06-10-2009, 10:01 PM   #20
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Default Re: AIR injection plugs

Quote:
Originally Posted by 83hurstguy View Post
Put in 1/4" NPT plug, it goes two turns in and stops.
That's all you need!


Quote:
I ordered the correct plugs from rockauto, they'll probably be here tomorrow.
You should of just accepted mine. I would have donated them for free for the '307 project'. I guess I will just give them to my friend to replace his rusted metal plugs. I'm trying to get rid of some of my extra 'junk' I don't need.
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Botched Olds 350 build by the crooks at Rocket Racing. Lunati 207/213 Voodoo cam, 8.1:1 CR ( was supposed to be 8.8:1 ), Stock #7 heads ( was charged for work that was never done and what was done was done wrong ), American Racing headers, Performer RPM intake, Qjet with 1/2" 4 hole spacer, 2.5" Pypes X-pipe system, cowl induction scoop.

Engine never ran the way it was supposed to from day one due to Rocket Racing's negligence. John Stolpa refuses to contact me about it.
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Old 06-10-2009, 10:05 PM   #21
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Default Re: AIR injection plugs

Quote:
Originally Posted by DoubleV View Post
You should of just accepted mine. I would have donated them for free for the '307 project'. I guess I will just give them to my friend to replace his rusted metal plugs. I'm trying to get rid of some of my extra 'junk' I don't need.
I do appreciate your offer... but rockauto can have them here next day b/c they are local. I want to fire it tomorrow or very first thing Friday morning, and didn't want to start beating you up to make sure you had them out today, etc...

Thanks.
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Old 06-11-2009, 12:48 AM   #22
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Default Re: AIR injection plugs

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Originally Posted by 83hurstguy View Post
didn't want to start beating you up to make sure you had them out today, etc...

Thanks.
awww how sweet
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Old 06-11-2009, 07:59 AM   #23
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Default Re: AIR injection plugs

Quote:
Originally Posted by joe_padavano View Post
The A.I.R. ports are NOT tapered thread (though you can force anything). They are straight thread inverted flare nuts. The seal is the flare at the end of the A.I.R. pipes. Dorman Products sells the correct plugs.


5/16":

https://www.dormanproducts.com/cgi-b...gory_lis t=:0

3/8":

https://www.dormanproducts.com/cgi-b...gory_lis t=:0
For give my ignorance. Why two sizes? Are there different sizes for 5A and 7A heads? If so which size is which?

Those links expired, so just incase anybody wanted the Dorman part numbers (and for future purposes):

5/16" - Part no. 490-492
3/8" - Part no. 490-493
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Old 06-11-2009, 07:53 PM   #24
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Default Re: AIR injection plugs

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Originally Posted by kartmaster View Post
For give my ignorance. Why two sizes? Are there different sizes for 5A and 7A heads? If so which size is which?
There are two sizes because I wasn't sure which was the correct thread size. There is a 1/4" plug as well. You should pull the A.I.R. manifold and measure one of the flare nuts to find the correct thread size.
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Old 06-11-2009, 08:28 PM   #25
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Default Re: AIR injection plugs

Personally, I'd just weld the f*ckers closed and be done with it. No buying plugs, no removal of manifolds. Are you ever seriously going to put this stuff back on?
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