yeah your supposed to run a break in lube for the cam, and then a quick oil change! i would go with the valvoline VR1 oil it's better for flat tappet cams...i would definately look into the flat cam dealio...there is ways to break in a cam properly...my oil psi when cold is between 70-75 and at that rpm around 40-55 i cant exactly remember
Close to mine, but yours is an older engine. I run a lil bit different oil, but Moo holds 85-90 until warmed up then about 65-70 after that. Pickle tends to start at 70, and holds about 50-55 after running a bit. I truly doubt these crankcase pressure issues are oil pressure related, else the pressures would be way down and pumping the pressure into the crankcase from these high volume pumps we all seem to feel the need to run.
Blowby seems to be the logical answer. BUT could be a head gasket issue, or an exhaust valve issue as well. I think Terry recently brought up some concerns I had a while back about hardened exhaust seats on these old boat engines and unleaded fuel. Terry has a way of round-a-bout making his point.......
Ray