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Avalanche 2500 Mystery Hole

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Old July 25th, 2020, 1:15 PM
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Default Avalanche 2500 Mystery Hole
Does anyone know what this hole is for? It spews exhaust fumes and makes it sound like I have a serious exhaust leak. Feels like I should have more power too. Don’t want to cap/plug without knowing more about it.

is it supposed to be there? Some suggestions from friends include casting leftover or testing port. I was hoping someone else with an 8.1 would chime in.





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Old July 25th, 2020, 4:49 PM
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Looks like an engine block water plug to me.
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Old July 25th, 2020, 5:46 PM
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Originally Posted by oilcanhenry
Looks like an engine block water plug to me.
If that’s the case I can just plug it no problem.
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Old July 26th, 2020, 12:57 PM
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On some of the older model trucks, there used to be a temperature gauge sensor in that hole.
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