Will get the intake plenum back on this weekend and do some observing of the valve cover pcv outlets and the oil fill tube pressure/suction while it’s running. I don’t have any oil on the throttle body side so that’s good.

I checked my compression and as expected on a rebuilt engine it’s good. Also came to mind that perhaps my intake isn’t sealing and it’s drawing oil directly into the cylinders but will focus on the pcv system first since it’s easy and I have obvious oil pooling in the intake runners.

 

Got it back together and running. Cold, hot, idle, high rpm or whatever the latex over the oil fill tube stays about neutral. Very slight movement either way. I rigged up a 4.6L Mustang PCV valve and trying that. Figure the vacuum and engine blowby should me similar. Only have a few miles so will drive it some. Used some clear vinyl tubing temporarily so I can see what’s happening and if it’s drawing oil.

One thing to mention, the new cylender liners installed by previous owner on the rebuild are oversize 0.080 at 3.780 so not sure if that could be messing with the stock oil vent system? I see from googling oversize bores can be problematic. Didn’t tknow that and wish it was just left as stock bore. So now I guess it’s a 4.8L haha