Re: Crank Case Pressure oil leaks ?? Help
You may need a PCV for a Z/28 or a 375 HP/396 CID since the manifold vacuum is low - PCV will have a weaker spring allowing it to open under less vacuum. However, the valve woul dbe open upon deceleration, max vacuum.
I haven't seen one in years, but there is/was a flowmeter device, 2 inch diameter gauge, one would place over the oil fill hole and it indicated either vacuum or pressure of the crankcase.
If crankcase is pressurizing, one would see oil at the filter on the valve cover much like seeing oil in the air cleaner base of an OE set-up.
An old shadetree trick is to remove oil fill cap and place hand over tube with engine running and after 30 seconds, one should feel a vacuum, if it was sucking/working.
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