Question on intake manifold

[VicS]

I bought an OM603 NA intake manifold with plans to modify for an intercooler setup.
I didnt notice in the pictures, but once I got it I found it has a brass nipple sticking out right above the flange, one for each cylinder. Can anyone tell me what they are used for in the stock application?

[tdoublenastywitit]

Your gonna run an intercooler on a NA engine?

[VicS]

No, mine is a turbo model. The intake on a NA model has an
open port to each pipe on the same side vs the crossover pipe
on the turbo model, which seems more adaptable for an intercooler.

[tdoublenastywitit]

Oh I see. That's cool.

[Alec300SD]

They are inlets for the blowby gases from the crankcase.
The crankcase breather hose on top of the valve cover connects to the inlets,
via the multi-piece plastic crankcase breather pipe unit that fits the nipples.

As you are aware, the inlets will need to be sealed when you use the intake manifold with your intercooler.




See video at 5:00 and 7:10 minutes in.

https://www.youtube.com/watch?v=Tvdd2xJeQHI