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Does anyone know the size of the O Ring on the coolant inlet pipe. I need to replace my lower intake gasket, and that O Ring is the one part I can't find any information about.
 

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Is it leaking, if not don't worry about it, I have had mine off at least 3 or 4 times over the last 11 years with no issue in re-using it.
 

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I have an extra in my garage so I measured it for you. It measures 19mm(ID) x 23mm(OD). Part number is ERR6434.

I tore a couple of them putting my truck back together three years ago this week when I did my headgaskets. So I bought two more and got it in successfully on the third attempt. Hence the spare. What made the difference for me was lubing it a little when inserting the pipe. Mike clearly has better technique than I.
 
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