Heard of a few MHG's with this issue leading to cracks in the gasket layers.
Personally I'd run a reamer through them but if done carefully a Dremel could work.
Where you'll run into issues is when you give it a squirt and back off you end up with 0 flow out of the engine due to the turbo compressor backing up if the BoV hasn't opened and this WILL build crankcase pressure.
I just added a real PCV valve to my system and it's made a huge difference as...
Dunno Wayne I got it direct from MoTeC as in the past I'd just been using old pins as fly leads and soldering them to the new wires ;)
I really need to pull ALL the harnesses and rebuild them properly but as ugly as it is it all works so I'm reluctant.
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