[Shotimes] Manifold Vacuum at Idle w/Stage I or II Cams

[Alan Fanning]

Since few of you have to deal with EGR systems, I may be optimistic in
inquiring if anybody has taken manifold vacuum readings on a v-6 SHO with
Stage I or Stage II cams before?

I have found that my '91 SHO (w/Stage I cams) registers 14-15 inches Hg of
manifold vacuum at idle. In comparison, the two stock v-6 SHO's I checked
are registering closer to 20 inches Hg at idle.

I know that cams with more overlap will result in lowered vacuum at idle.
It hadn't occurred to me, though, that the cams might be indirectly
affecting my NOx readings by reducing the vacuum available to operate the
EGR system.  

Always more to learn about these puppies...

    Alan