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Originally Posted by PTAddict
Basically, yes. The most important specs of a cam are actually the "valve events" - the opening and closing points of intake and exhaust valves. The optimum valve events for a given application depend on a bunch of parameters - port efficiency, valve size, intake runner length, cross section, and taper, compression ratio, header specs, and then desired operating parameters like peak power RPM, idle quality, etc, to name just some of them. Any off-the-shelf cam will only be a rough approximation of the "ideal" valve events, and variances from the specs of that cam may improve or degrade performance.
Cams for OEM engines these days start out as quite precise optimizations from very advanced engine simulation software, with final refinement in real world dyno testing. As performance enthusiasts, we don't have access to these kinds of simulation resources, so we have to rely more on advice from cam manufacturers and fellow enthusiasts. But nobody - not Crower, and for sure not me, can tell you for sure the "perfect" specs for your cam. Fortunately, you can still get very good results by being "close enough".
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PTaddict:
Thanks for your explanation. It is clear now. I appreciate you taking the time to educate me.
Ty