Join Date: Sep 2006
Location: Vancouver USA
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Yup -that's an EGR tube for a late 258. You can plug both ends, but your EGR won't work, if that's important to you or your state emissions station.
I'm not sure what the thread is.
No emissions to deal with in the middle of Washington State but the advantage to having an EGR valve is it keeps the combustion temperature in the cylinders down which help with the longevity of your engine. I don't think it cost you that much to have it functioning.
1978 CJ5, AMC 401, CJ T18, Scout D300, 2 1/2" Lift, Locked Front/Back