How low on the sump is the oil return line.
I had a sump made for a RB a while ago, the issue was the return was at the oil level in the sump.
A little bit of crankcase pressure would push oil up the hose and overflow the can.
I ended up fitting a one way valve on the line, this fixed the issue.
It was easier to fit a oneway valve than pull the engine and redo the sump.
-10an if I can recall correctly
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