im just about to start my friends newly built cossie engine for the first time , but he has just informed me that the engine builder put a bung in the hole directly under the breather hole in the cam cover.


im assuming its a breather to vent crank case pressure and should deffo not be blocked?

also this car has no hole in the cam cover. why was it on some cars and not others?

where does the crank case pressure go when the cover has no hole?

help please as he thinks its fine and im being stupid