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I would not put too much stock in my readings with the vacuum connected. As it was explained to me by Paul, it fluctuates a lot and that is why you should measure with the lines off - I was just curious, and like Bill said, sustained 6000 RPM with no load is a bad thing...
Greg,
You need to separate what happens at rest blipping the throttle from what actually happens under load. Vacuum advance is additive, but in practice the engine rarely runs at high rpm with high manifold vacuum. If your 35 BTDC readings were with vacuum connected, they are meaningless. Pinging happens under load when there is little or no vacuum advance. You should be able to run at least 25 BTDC without pinging under load with 93 CLC octane unless there is something else wrong with the engine.
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Paul
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