1. Idle: At idle, the vacuum pressure on a Chevy 350 should typically range between 15 to 22 inches of mercury (inHg).
2. Cruising: While the engine is cruising at a steady speed, the vacuum pressure should typically be around 18 to 20 inHg.
3. Acceleration: During acceleration, the vacuum pressure may drop slightly, typically to around 12 to 15 inHg.
It's important to note that these values can vary due to factors such as engine wear, camshaft profile, carburetor/fuel injection tuning, ignition timing, and any modifications made to the engine. If you suspect an issue with the vacuum pressure on your Chevy 350, it is recommended to consult the specific repair manual for your engine or seek advice from a qualified mechanic.
