Engine Vacuum Flickering at Idle

[fasttback]

Just checking if idle vacuum flickering is normal for a rather big solid roller cam in a 347:

lift- 0.600 w/ 1.6 rockers

duration- 249 I and 263 E @ 0.050

The engine vacuum (at idle) flickers around from 6.0 to 7.5. It's a steady pattern with an occasional jump. Anything to be concerned about?

 

[RUSTYNUT]

Low vacuum on that big of a cam would normal. I would worry if you have power brakes or any other goodies that need engine vacuum to opperate.