DO NOT block the vent line. You can simply vent the crankcase to atmosphere (with some sort of filter on the end).
A better idea is to consider an air/oil separator. Check out my post here:
http://www.talkmorgan.com/ubbthreads.php/topics/647169/breathing-without-slobbering#Post647169
Last edited by Bitsobrits; 14/10/22 08:46 PM.