Hi all,   I have what appears to be an early model valve cover, with only one opening which i assume is for a breather.   I wish to put this on my 5k (due to the fact that its polished), however I have concerns over pressurising the valve cover. Can anyone advise me to how were they vented/set up on the earlier models (ie, do they have a PCV valve, or are they vented directly to the atmosphere), or if you have fitted one to a 4/5k, how did you plumb the system.   Cheers in advance   Andr