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I see references above to the pressure relief valve/spring and also pressure as indicated on the oil pressure gauge. Both of these things are for the pressure circuit, not the scavenge circuit. Pressure in the scavenge circuit should be less. A lot of what's pumped out of the engine is air. And aside from the filter and cooler, the oil just has to travel through the oil lines and then dump into the tank, which is vented to the atmosphere.
That said, cold oil means higher pressure (even if not in the oil cooler). I haven't heard of anyone measuring pressure in the scavenge circuit because generally speaking it doesn't matter. If it were me, I'd play it safe and assume the oil lines you get (or have made) can withstand the same 70 psi or so that you see on your gauge. That will be more than they'll probably ever see.
Scott
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