Originally Posted by kyle86
What? That's my manifold vacuum reading at cruse rpm. What's wrong with that?
The cruise RPM he listed was low about 2300 if I remember, now every engine will have its own characteristics but at that RPM with the cam he is running 20" does seem high. From my experience with my 383 and a 221 duration cam at 50 thou (less duration than his) I am pulling only about 14-15" at that RPM at a steady state cruise, the only time I come to 20" is if I am off the pedal and the gearing is causing the truck to decelerate but I have an 1405eddy and am on manifold vacuum. That is why I asked about checking his vac gage to be sure it was accurate. If the gage is off then it will hamper his tuning setup.