Steve Shauger's "Reliving My Youth" 1969 Z/28

[Steve Shauger]

Originally Posted by cruiserofland

Steve, might I ask at what RPM is it making 11 inches? My previous owner had the idle at 750, and when I dialed up to 950 hot it helped a lot with stable idle and the power brakes (though I have the mild 30/30 cam and .030”/.030” lash). I also did not make enough vacuum when I tried .026”/.026”.

RPM is 1100. I connected manifold vacuum to vacuum advance and idle is now stable. This is not fixing the root cause, but car runs perfect now. I'm going to verify the PCV is not the low vacuum source. If all else fails I will increase the valve lash which is now 16 &18 to 20 & 22.