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I run OEM valve covers on both cars and also pull intake vacuum to help evacuate crank case pressure. C7 gets just a tiny bit in the intake tube. Other than that, there isn't oil anywhere in either car. I run my 900whp Ram the same way. Metco on one valve cover and MM catch can that vents under boost on the other. Line still routed to the air intake to pull crankcase pressure as well under boost. Works perfect. Since the C7 is 20+psi and ~1,100whp there is a line straight from each valve cover to the intake tube.
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