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One other thing to add to this list is something that Bill Stipe, James Rogers, and I have discussed in our chats, is that all reground cams on the market are not equal in quality either. If one is truly concerned with performance, then a degree wheel and a dial indicator should be used on all four tappets to verify lobe uniformity between each valve not only in lift, but in valve timing. Just as Marco pointed out, less duration is what is needed to get the 'I' valve closed faster so it can start building static compression on the compression stroke. Hypothetically having one lobe ground where it opens & closes later in relationship to the others will potentially not allow it to build as much compression in that cylinder as compared to the others, thus creating a cylinder imbalance. Think about how this can affect the smoothness and the overall power of the engine.
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