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Made a similar solution back in 2004 on my 8RT engine.
Did not use a PCV valve, my reason for this was that Volvo B18/B20 Engines, had a line from the crankcase to the intake and the hole entering the intake was around 2mm, not causing any problem for the engine and keeping the crankcase clean.
Since this was a V8 i used a 2.5mm hole.
I let the pictures do the talking.
By the way i don't own the car now , but the new owner is still driving it without problems.