Trying to come up with a fix for leaking rear main seals on a fleet of these units, as we believe there is to much crankcase pressure being made. These units were built without a pcv valve system and only had a breather hose coming off the left bank valve cover. These engines are run on natural gas and are compressing natural gas. So, the right side of the engine is the compressor. There is a pipe plug on the carb adapter that I can pull vacuum from, as the intake is not drilled anywhere, and I can plumb a pcv valve on at the nipple of the valve cover. My question is where or how can I get a breather in the system, or do I need one? I tried using a 2 hose pcv valve, putting a small breather out off of the smaller connection, but it just acts like a vacuum leak, so that's not going to work. Would just a push in breather installed in the valve cover work? Thoughts???

Thanks.