I have a pretty rough idle as of late so I checked my vacuum and I am at 15 with a needle bouncing from 14 to 16. I am running a 92 460 bored 60 over, headers with multiport EFI and over sized valves and a milled head. My cam is:Voodoo part number61602. 219/227 @ .050" lift. I know what to expect out of a vacuum reading in a totally stock engine but with this cam what should I expect for vacuum at idle and how steady of a needle should I expect?

 

Steady bounce 14-16 check igniton, plugs etc.

 

Do you have the factory efi?

 

No, I have a custom efis system. Which is basically GM electronics with Ford injectors. The computer controls the timing as well.