Helping a friend, RV late 70s, Ford 460 engine. This thing has is vacuum activated, ajustable and connected to the carburetor with a metal chain (like a toilet chain), when you open the throttle it pulls against the vacuum pull. It has electric wires to, but can follow to where it goes.
Can someone tell me what is the purpose of this device?
Can someone tell me what is the purpose of this device?