What year heads? Pretty sure the later heads might have a hole there but it is blind. I know my Eagle heads do and my brothers 6.4 heads did. So those heads would need the tube.
If you have the ‘08 and down heads, not sure what the solution is.
I have eagle heads, don't know what year. I will put my finger over it and turn the motor over to see if it is open, I just assumed it was. Fingers crossed!
