Catch can? Thats the same thing as your coolant overflow bottle except for oil.

Its better to burn than let sit in the valve cover. For racing purposes you dont want to burn the oil, only fuel.

Back in the day engines did not use breathers, they dumped directly on the ground from a hose. This is why you see solid black lines on the road in old movies. Just watch the begining of CHiP'S and you'll see what I mean.

On a stock engine, breathers will do little besides looks

catch can