I have on many big cammed engines used a fixed orifice PCV. On street cars here, a working PCV is reqd for registration. I calculated the orifice area of a stock PCV at idle & came up with a round hole of 7/64" diam.
I cut open the PCV, discard the innards & braze in a disc, in which I drill a 7/64" hole. Then braze the PCV back together.
Have done many over the years & work well.
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