I have a Dart alum block set up on dry sump. The oil pressure is good at idle, but after it runs 15-20 minutes and warms to around 140 the oil tank runs low/dry and oil starts pouring out the valve cover breathers!!! Does anyone have any idea what is going on? I can rev it up and it draws it down/back into engine for a second, but as soon as I let up back out it comes! I have changed the dry sump pump to another used one with the same results. ANY ADVICE? IDEAS? Thanks!