I have a BOP rear main seal installed. One of the reasons why this issue is frustrating.

I have been mulling through threads on this subject on this site and PY along with remembering exactly what I was doing before and after finding this leak.

I had made a couple of local road trips at low speeds - nothing over 35 mph. No leaks. It's not until I started longer shakedown cruises over 40 mph that I would have leaks. I have a 3.55 rear, so those later rides were pushing 3000 RPM.

I am going to try a couple of things over the next few days before I consider changing out the 30 weight oil. I am going to start it up again in the garage and let it warm up and idle without going much about 2000 RPM and see if it leaks.

I should have enough breathers and grommets from my previous experiments to be able to at least set up one valve cover breather plumbed to the air cleaner (what I have now) and just a 2nd open breather on the other valve cover. The chrome air cleaner I have did have two breather hose nipples on it, I just blocked one of them off. I also have another breather with a hose nipple, it's just that that nipple was a bit large for the 5/8's hose I was using.