I'm not trying to hijack but want to ask about my similar timing concerns. I think this is exactly in line with what has been discussed here for several pages. Ya'll may have even answered this and I missed it. I'm running 17 initial timing without vacuum advance, 33 at idle with vacuum advance all in, then 34 total by 3,000 rpm. So, yes, I've got the dreaded 16 degrees of vacuum advance. However, I'm not hearing any pinging and I don't see any shiny specks on my plugs. What benefits am I missing by not using the Lars VAC? I already have one but have postponed installing it for all the reasons listed above. Plus, I wonder if I might idle hotter in the summer with my vacuum advance limited to just 10.