[Chevelle-list] vacuum

[Jim & Chris]

where is the best place to check the vacuum and what should it be ? 15in.? I 
have 6in. of vacuum at the timing advance port on the carburetor.the timing is 
at 8 deg. BTDC .when I unplug the vacuum advance hose nothing changes. idle and 
timing remain the same and the car is driveable and seems fine. Jimmy.C