Porsche Hastech Engineering Porsche 911 Crankcase Ventilation Oil Blow by Separator H911 106 KIT SMC53106120 Porsche Timing chain tensioner for 1620750110 Porsche Timing chain tensioner for 911 (late 1983 1989) New and improved version with machined end to fit into bumper guard Porsche Hastech Engineering Porsche 911 Crankcase Ventilation Oil Blow by Separator Features and Benefits:Reduces the oil blow by from the crank ventilationKeeps the oil in the engine while still allowing good crank ventilationVery simple mounting sandwiches between the crankcase and ventilation the lid breather coverUsed on all Hastech race & street enginesRecommended for all aircooled Porsche 911 engines to help reduce oil consumption caused by ingestion of oil laden air into the intake caused by excess crankcase windage and blow by