Vacuum Pump Systems > Products These innovative Crankcase/Oil Pan Vacuum Systems offer primarily the wet sump/external pump racer the very same horsepower advantages of negative crankcase pressure available only through the use of an efficient dry sump system. The system is very simple to install. The vent tubing connects the existing valve cover breather to the belt driven vacuum pump. We highly recommend STEF’S part #5122 to be installed before the pump. The pumps discharge is then vented through the system’s breather tank assembly via -10AN braided line*. Listed below are accessories that complete the vacuum system installation. Each item and kit are engineered for its best possible placement. Some fabrication may be required. Part No. Application 5134 Billet Aluminum Vacuum Pump Pulley-4 3/4" 5135 Billet Aluminum Vacuum Pump Pulley-6" 5140 Vacuum System-Wet Sump-SBC-Belt Driven 5141 Vacuum System-Wet Sump-BBC-Belt Driven 5142 Vacuum System-Wet Sump-SB Ford Belt Driven 5143 Vacuum Pump Replacement 5144 Vacuum System-Wet Sump-BB Ford Belt Driven Recommended Option 5122 Air / Oil Separator 5123 Air/Oil Separator -12AN IN -12AN OUT Moroso 5128 Air/Oil Separator 3/4” NPT IN 1/2” NPT OUT Star Machine *Our pump assemblies do not include plumbing lines. *Joe’s Tech: Tech 1 - Vacuum can vary from 8 to 15 inches depending on the engine’s ring seal and overall gasket seal. Tech 2 - When using a vacuum pump system there will be a decrease in oil pressure. This will vary with each engine and needs to be addressed for proper oil pressure.