[SFfiredog]

Hello,
Exhaust scavenging of the crankcase or "pan-evac" has been around for a long time in drag racing circles. Unfortunatley, it is only effective above 5000 rpm and requires a 5/8" to 3/4" hose routed from each valve cover to the header collector. An anti-backfire valve (one way valve) must also be installed in the hose from the header to prevent exhaust gases from being blown back into the crankcase. it is not effective or practical on the street.
HTH
Mike