LT1-LT4 Modifications 1993-97 Gen II Small Block V8

What size plug to close off EGR hole in header?

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Old 05-07-2010, 07:17 PM
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Default What size plug to close off EGR hole in header?

I'm in a rush, the plug I had there somehow vibrated loose and popped off somewhere. I have looked everywhere and noe of the pipe plugs I can find are the right size so what size do I need? I have heard of people using oild drain plugs for this but I' still need a size. Help ASAP!
Old 05-07-2010, 07:23 PM
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My fault and in a rush...I mean the holes in the header where the AIR emissions system is supposed to go.
Old 05-07-2010, 07:29 PM
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Let me know when you find out! Been needing this info for a while!
Old 05-07-2010, 09:36 PM
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I used an M22 oil drain plug from NAPA
Old 05-07-2010, 10:31 PM
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^ yep thats what works..i listed the threads an **** once but i cant remember..lool on advanced or autozone on here and it might say what the thread size is so you can go to ace or lowes and get one
Old 05-08-2010, 02:36 AM
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M22 for OBDI, M18 for OBDII.
Old 05-08-2010, 01:38 PM
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Originally Posted by RamAir95TA
M22 for OBDI, M18 for OBDII.
what about when the threads are on the outside of the AIR plugs on the headers?
Old 05-08-2010, 01:39 PM
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When are the threads on the outside?
Old 05-08-2010, 07:08 PM
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M22 fit perfect! Thanks
Old 05-08-2010, 07:14 PM
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M22 x 1.5 I just bought 2 and put them in the manifold on a B-body LT1 in a 70 C-10. They had them on the shelf at Oreilly's
Old 05-08-2010, 08:10 PM
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Originally Posted by RamAir95TA
When are the threads on the outside?
ive read about that on here,its an after market header that is like that..not sure of its pace,headman or another..
Old 05-08-2010, 08:37 PM
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Originally Posted by suicidal racing
ive read about that on here,its an after market header that is like that..not sure of its pace,headman or another..
pacesetters, got them 2 yrs ago and the threads are on the outside.
Old 05-08-2010, 08:44 PM
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Unless I could tap new threads on the inside and use those threads??
Old 05-08-2010, 09:42 PM
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I'm not sure of the OD threads on aftermarket parts, sorry.
Old 05-08-2010, 09:43 PM
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Originally Posted by porksoda
M22 fit perfect! Thanks
You're welcome.
Old 05-10-2010, 04:20 PM
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Also, just for reference, the M22 is the drain plug for a Dodge Ram equipped with a 5.9 liter Cummins diesel.



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