How to plug Smog (AIR) ports in exhaust manifolds - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

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post #1 of 19 (permalink) Old 07-30-2007, 03:53 PM Thread Starter
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How to plug Smog (AIR) ports in exhaust manifolds

We are putting a '95 Camaro LT1 into a '86 Monte Carlo SS. While I was going to retain the engine in factory condition for the initial swap, I have found moving the A/C compressor from the passingers' side to the drivers's side of the engine with a Bowers Rod Shop relocation bracket kit to be a better alternative to notching the frame and fabbing a right engine mount. However, the Bowers bracket sits in the area of the factory AIR pump, so we have decided to delete the pump and lines. But, I am having no luck finding a set of threaded plugs to plug up the holes left in the manifolds. Does anyone have any experience in this area? Someone told me to look around bigger auto parts stores for a large metric oil drain plug for a ricer, but so far I haven't found a large enough plug......
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post #2 of 19 (permalink) Old 07-30-2007, 04:31 PM
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I would plug them by installing headers that didn't have AIR/EGR fittings.
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post #3 of 19 (permalink) Old 07-30-2007, 05:36 PM
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You can use headers for a regular gen 1 sbc on the LT1 just use the header gaskets that come with the headers or upgrade to copper or whatever you like . But if you want to use the manifolds I think they are pipe thread so maybe a trip to the hardwarestore is the answer.
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post #4 of 19 (permalink) Old 07-30-2007, 05:47 PM
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I wanna say its a 22mm plug.
post #5 of 19 (permalink) Old 07-31-2007, 02:11 PM
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go to a menards or somewhere that has threaded rod, use a pitch gauge etc to get the right diameter and pitch or just bring in the little section of pipe with the nut on it to the store. then cut the length of rod flush with the hole and use some thead sealer or gasket sealer in the threads just to make sure its sealed.

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post #6 of 19 (permalink) Old 07-31-2007, 02:44 PM
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or take the easier route go by napa and ask for a brake fitting thats 3/4 i think ask for however many you need and install em, i cant remember if its 3/4 or 7/8 but it is standard. or take in the fitting from the line that plugs into the manifold and ask for a fitting thats plugged, thats like the fitting from the manifold

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post #7 of 19 (permalink) Old 07-31-2007, 06:15 PM
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The size plug you want is M22X1.5

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post #8 of 19 (permalink) Old 07-31-2007, 07:00 PM Thread Starter
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Hardline 42 got it. It is a M22X1.5 metric, and the easy fix is to go to your local auto parts store and get 2 replacement oil drain plugs for a '94 to '01 3/4 or 1 ton Dodge Truck with the Cummins Diesel engine.

Thanks everyone!
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post #9 of 19 (permalink) Old 07-31-2007, 08:59 PM
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Quote:
Originally Posted by CKJ View Post
I wanna say its a 22mm plug.
That's correct. They are metric M22

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post #10 of 19 (permalink) Old 07-31-2007, 09:07 PM
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That's correct. They are metric M22
Thats the exact phrase I heard, M22, but thats been about 3 years ago when I heard that. Didn't want to speak too soon
post #11 of 19 (permalink) Old 07-31-2007, 11:45 PM
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the ones i got were standard and fit exactly, worked great, maybe its the earlier LT's that are standard, or maybe its kinda like other stuff metric and standard are so close together theyre basically the same

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post #12 of 19 (permalink) Old 08-09-2007, 12:17 AM
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i saw a guy weld his closed

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post #13 of 19 (permalink) Old 08-10-2007, 01:38 PM
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With them capped and the egr tubes unplugged will you still pass the infamous smog test, for those of us in sniffer counties?

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post #14 of 19 (permalink) Old 08-10-2007, 07:19 PM
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i used a 5/8 flare cap on my pacesetters cause i wanted to keep the egr fitting. just go to a lowes or home depot in their plumbing section. thats where i found them.
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post #15 of 19 (permalink) Old 08-13-2007, 10:12 PM
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