A supplied vacuum hose was run from the brass port on the surge valve to the passenger side of the intake manifold. A supplied 3/8-inch tube was attached to the crankcase vent port, which was just behind the oil fill neck. The plastic air tube running from the top of the intake manifold to the rear of the driver-side valve cover was removed and the proper tube connections were routed to a provided check valve, which will alleviate pressure and help avoid oil leakage.
2008 Chevy Silverado ProCharger Supercharger Installation - The Heart of a Cover Truck