Porsche Willhoit Anti Drain Back Valve - 911 65-89 SMC-005-020 Option:911 (1965-1971) 8L engines (1970-1976)

8L engines (1970-1976)

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Porsche Willhoit Anti Drain Back Valve - 911 65-89 SMC-005-020 Option:911 (1965-1971) 8L engines (1970-1976)Porsche Willhoit anti drain back valve for 911 (1965 1989) models. Four cam cars, and all 911's up to 1989, have a dry sump oiling system. The oil for the engine is stored in a tank in the fender well and not in the crankcase as in a wet sump engine (like the 356). A dry sump system has several advantages: Since no oil is stored in the crankcase, the engine case can be made smaller and the engine can be mounted lower in the car, lowering the center of