C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

exaust manifold fitting

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Old May 18, 2015 | 02:01 PM
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Default exaust manifold fitting

the air fitting on the center of my exhaust manifolds have got to go with the air pump and egr assemblys. I already have them programed out (92lt1) Does anyone know the size of that fitting so I can find a plug. Is it pipe thread or standard bolt thread and what size?? I know I could cut the pipe off and weld it shut but id like to keep the assembly complete in case Michigan gets a case of the CA smog police Thanks a bunch.
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Old May 18, 2015 | 03:04 PM
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that size is 7/8-18 threads. dorman # 65231, need 1 for each side and I believe it is a oil pan drain plug for a dodge truck.
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Old May 18, 2015 | 03:51 PM
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you are the man! just ordered a couple from ebay
Originally Posted by Sleazy Rider
that size is 7/8-18 threads. dorman # 65231, need 1 for each side and I believe it is a oil pan drain plug for a dodge truck.
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Old May 18, 2015 | 05:52 PM
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If they're 7/8-18 thread then I believe I'd buy 5/8 INV FLARE plugs to do the job correctly. Those should seal correctly and if I'm correct you should be able to look at what you've removed and see that it resembles an INV FLARE. You should also I'd think be able to look into the manifold and see the sealing surface. The INV FLARE does the correct sealing so if you wanted to go back you wouldn't have to deal with deterioration of the threaded bore.

If you needed to shop these locally they could be referred to a -10 if you were shopping a Parker vendor.

** I checked with a jobber that I'd customarily buy from and I don't see the offering. Is there? Maybe.

Last edited by WVZR-1; May 18, 2015 at 07:04 PM.
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Old May 18, 2015 | 06:14 PM
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came to see you sunday.. you were in church....since it's back to the 30's again, I'll be by when it warms up....my florida vette doesn't like cold, ( or rain/snow)....is it really may ????? My wife is NOT a yooper and not pleased...!!!!
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Old May 19, 2015 | 06:36 AM
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stepson said you stopped by. Heck pal your throwing away a big part of summer around here. If theres no snow its beautiful out. Vettes still torn apart but your sure welcome to stop over for a beer or a visit. I around most days. If im not home listen for shooting and if you here so go over to the old Yamaha shop and take the road back to the sand pit.
Originally Posted by playsdixie
came to see you sunday.. you were in church....since it's back to the 30's again, I'll be by when it warms up....my florida vette doesn't like cold, ( or rain/snow)....is it really may ????? My wife is NOT a yooper and not pleased...!!!!
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Old May 19, 2015 | 06:39 AM
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had to chuckle just said that about snow and looked out the window and it was snowing!! Didn't last long though, just a couple minutes.
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Old May 21, 2015 | 06:52 AM
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Also for future reference, an oil pan drain plug for a 5.9 Cummins 12v or 24v is an exact fit.
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Old May 24, 2015 | 07:14 AM
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got them yesterday and they worked perfect. Thanks.
Originally Posted by Sleazy Rider
that size is 7/8-18 threads. dorman # 65231, need 1 for each side and I believe it is a oil pan drain plug for a dodge truck.
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Old May 25, 2015 | 11:59 PM
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now you have a piece of 'Americas import' on your vette.
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Old May 26, 2015 | 06:30 AM
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maybe it will be fooled into thinking its a 480 hp srt hemi!!!
Originally Posted by Sleazy Rider
now you have a piece of 'Americas import' on your vette.
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