SternDriveEd
Seaman Apprentice
- Joined
- Mar 1, 2022
- Messages
- 39
To Buzzsaw, the fitting you show near the bottom of the carburetor is for Manifold Vacuum. You can prove this by feeling suction at the fitting when the engine is idling. It’s not for the vent line that we’re all talking about. It was typically used in cars for supplying engine vacuum to the dashboard heater controls to operate the blend doors. Sometimes it was used to control timing advance on the distributor.