I have a 97 TA in the shop right now that is a 355 with LE3 heads and a gm 847 cam. I'm showing 10 inches of vacuum at idle. Curious as to what everybody else with similair setups are showing for vacuum at idle.



Thanks!


Mike

 

I have 12"

 

I have 17. Is that normal?

 

I am not the cam guru but that don't sound right.

 

I had 19" with my 211 cam and I think my 847 had 15". As long as the gauge snaps to zero at WOT and snaps to a vacuum reading when decelerating or when your foot's off the accelerator you should be fine.

 

That makes perfect sense to me too, but it still seems wrong.

 

I had about 12" too. If you're reading 17" then you have a defective vacuum guage.