Neutral
KC not getting enthusiastic about a vacuum advance unit is no surprise. Pretty much the same way for all the major engine builders. The vacuum advance add's another level of complexity and risk to the engine. The concern is if you get to much advance you can damage the engine, so why risk THEIR warranty by introducing yet another variable? Same basic reasoning applies to hydraulic roller cams, thats a no brainer when it comes to "warranty", low risk, easy to install. It's the "kiss" principle at work.
BUT, if you know what your doing a vacuum advance is a good thing! And a flat tappet WILL outperform a hydraulic (now wait for the excuses about how modern is better). IS it? Not always.
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