Hello oldsmobile family , I have a stock overhaul 73 olds 455 that the stock valve cover pcv valve grommet that keeps letting the pcv valve slide out . Of course wasting a little oil . My question is , is the pcv valve necessary or can I just put a breather cap in that area? I have a breather cap on the passenger side and only reusing this to connect vacuum hose to elderbrock carb.

 

The PCV valve is necessary. Before PCV cars used a road draft tube designed to vent the crankcase. Make sure you have a new grommet in your valve cover for the PCV.

https://classicoldsmobile.com/forums...grommet-13604/

 

Motors didn't last very long before PCV valves. They gummed up well before 100000 miles. UTG had an interesting video on the subject.