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17-21 inches is the range a engine vacuum should be in. I got a steady 20inches vacuum ( at sea level ) after re-setting tappets and adjusting carb idle/air screw. I also adjusted my timing with a vacuum gauge which ended up being about 3-4 degrees BTDC ( again sea level ). One of the Change...

NamVet You could have a point. Like you said each vehicle is different my rebuilt 230 ran much better at at the wider settings.

I reset mine from the OLD settings to the updated ones and the flutter I had on my vacuum gauge went away. I also had no tapping and more power As I have read, the military went to the new clearances after getting a lot of vehicles with burnt valves.

Make sure you adjust them as per "Change One"