Hello everyone, so I'll jump right into it. I'm removing my Intake Manifold on my 01 Durango 4.7l and noticed that there is a hole in the block just below the oil dipstick, is this a drain back hole? Can I plug it? Is this normal? I'm removing the intake because i noticed a little pool of oil building up in the galleys(driver side).

 

Can you post a pic??