The common wisdom is/has been that 1-1/2" is about the maximum height that one can elevate the heel without causing substantial damage to the foot. Over the years I have spoken to podiatrists and other foot specialists who have pretty much confirmed that rule of thumb.
That said, individual feet will respond differently. The human foot is one of the most complex structures in nature...consisting of five arches (according to some authorities) and a a wonderfully intricate framework of muscle, tendons, ligaments and bones. Asking it to function...bear the whole weight of the body, and simultaneously act somewhat like a gyroscope--keeping us upright and balanced...while tilted on one corner is asking for trouble.
And, the better quality the shoe the less the heel height can be raised or lowered without not only distorting the shoe but throwing off gait and weight distribution. In most cases lowering or raising the heel height more than 1/8" (3mm) from the heel height set by the last, will destroy the shoe, the fit, and threaten the foot.
Don't do it! Not if you care for your shoes.
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