11" of vacuum at those settings is about right. My original runs about 11"-12" at 750 to 800 rpm! That 87 degree overlap 041 cam is a lot and the vacuum will be low. I've seen cars back in the day with non-stock performance cams so wild they hardly activate the power brakes near idle. I had a stock RAIII car with the 744 cam years back that had relatively low vacuum at idle, but it wasn't quite as low as the RAIV engine. Very few original RAIV engines exist today and the ones that do have been worked on, bored, modified, etc. many times over which will affect the idle vacuum. However, your figures are normal for a stock RAIV engine!
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