A.i.r. Exhaust manifold plugs - Team Camaro Tech
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post #1 of 14 (permalink) Old Sep 11th, 10, 01:43 PM Thread Starter
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A.i.r. Exhaust manifold plugs

What type of plug bolt was used to plug A.I.R. holes on non A.I.R. equipped 68 small blocks? Square head, hex head??
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post #2 of 14 (permalink) Old Sep 11th, 10, 10:28 PM
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Garth
 
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Re: A.i.r. Exhaust manifold plugs

Well, I maybe be wrong, but don't believe the plugs are a factory item.... Non A.I.R. engines used different manifolds (no holes).

I'd say the plugs are aftermarket or maybe dealer ?? installed, so why does it matter what type of head is used ?

Please don't say "bad answer".....

  • '68 RS, AA, 749, L30, M(uncie)20 (originally a 3spd), 15yr backburner resto........
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post #3 of 14 (permalink) Old Sep 11th, 10, 11:37 PM
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Re: A.i.r. Exhaust manifold plugs

i've used 1/4" pipe plugs- yes, the threads are wrong, but they work..

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
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post #4 of 14 (permalink) Old Sep 11th, 10, 11:59 PM
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Re: A.i.r. Exhaust manifold plugs

I've used square head plugs before but as Maro stated the non A.I.R engines didn't have holes in the exhaust manifolds.
Doug

1969 Van Nuys RS Z/28. Protect-o-plate and chassis broadcast copy. Hugger Orange, original 711 interior, including carpet. Original drivetrain: DZ, M-20, 3:73 BO code peg leg. Flat hood, no spoilers.
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post #5 of 14 (permalink) Old Sep 14th, 10, 08:25 AM Thread Starter
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A.I.R. plugs

What type of blots were used to plug AIR holes in exhaust manifolds?
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post #6 of 14 (permalink) Old Sep 14th, 10, 02:09 PM
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Re: A.I.R. plugs

Some had square heads (most common), others were hex head.

A.i.r. Exhaust manifold plugs

  • '68 RS, AA, 749, L30, M(uncie)20 (originally a 3spd), 15yr backburner resto........

Last edited by Garfields Maro; Sep 14th, 10 at 02:21 PM.
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post #7 of 14 (permalink) Old Sep 14th, 10, 05:20 PM
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Re: A.I.R. plugs

All '68-'69 small-blocks with manual transmissions used A.I.R. systems, except those for overseas export with RPO KD1, Less Air Injection. Those units used hex-head 1/4"-18 National Straight Pipe Thread plugs, P/N 3889330, for the holes in the exhaust manifolds.


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post #8 of 14 (permalink) Old Sep 14th, 10, 06:00 PM
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Re: A.i.r. Exhaust manifold plugs

See your other thread in this section and the same thread you posted on the CRG Forum.

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post #9 of 14 (permalink) Old Sep 15th, 10, 07:55 AM
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Re: A.i.r. Exhaust manifold plugs

try to stick to your own threads and not start new ones on the same topic, its easier for folks to follow up with you in one thread.

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post #10 of 14 (permalink) Old Sep 15th, 10, 10:33 AM Thread Starter
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Re: A.i.r. Exhaust manifold plugs

Sorry for the duplicate threads. Well I'm mistaken, I thought only the 'LOS' built Z/28's had the AIR system and not the NOR built cars? I bought my 68 Z 2nd hand in 1970 and there was no smog equipment on it and the exhaust manifolds had the plugs in them, so now I need to find 68 smog equipment parts, CRAP!

Once again my apologies.
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post #11 of 14 (permalink) Old Sep 16th, 10, 08:26 AM
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Re: A.i.r. Exhaust manifold plugs

Quote:
Originally Posted by pjbizjak View Post
Well I'm mistaken, I thought only the 'LOS' built Z/28's had the AIR system and not the NOR built cars?
Nope. Read this:

http://www.camaros.org/emissions.shtml


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post #12 of 14 (permalink) Old Sep 16th, 10, 03:38 PM Thread Starter
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Re: A.i.r. Exhaust manifold plugs

Thanks JohnZ, I looked at CRG but missed that. Any markings on a 68 Z that tells it was an overseas unit?
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post #13 of 14 (permalink) Old Sep 16th, 10, 03:57 PM
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Re: A.i.r. Exhaust manifold plugs

Quote:
Originally Posted by novaderrik View Post
i've used 1/4" pipe plugs- yes, the threads are wrong, but they work..
Same here.Just buy "Brass" and use a good Anti-Seize compound.

Ideas are like children: there are none so wonderful as your own.
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post #14 of 14 (permalink) Old Sep 16th, 10, 05:05 PM
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Re: A.i.r. Exhaust manifold plugs

It was common back then to remove the smog system to increase horsepower. Some did it the same day they brought the car home. A buddy bought a 69Z from the original owner, and got several boxes of take-offs in the deal. The smog was removed the first week the guy had the car.
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