I picked up a used CH4B intake this week, and I was checking it out yesterday. On the passenger side of the intake in the heat-riser area there is a small hole down between the runners, maybe 1/8" in diameter. Is this open to anything on the inside, i.e. need plugged to prevent a vacuum leak?

The one I have here is a little different than the one pictured, but the yellow arrow shows the area I am asking about. Mine does NOT have the flat machined pad there with the two holes in it, just the runner for the heat passage and the small hole is there.


Thanks,
Darren