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Duration at .050" (along with engine size, head flow, etc.) is what I use to determine where the peak hp will be. However, it's not the only one that matters. Advertised duration and duration at .200" will give you an idea of how fast a valve will be opening and closing and how radical the lobe is. Of course advertised duration is used to determine DCR.
You will get a lot of differing opinions on things like cams, but the easiest way to get the right one is to call a guy that builds and dynos engines for a living.
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