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I don't think there's any loss of power. I think the main reason is that it's more expensive to build. No, I don't know that for a fact, but I would suspect that it is more expensive to machine things so they are offset like that, and there may be extra steps (or checks) during assembly.
That's definitely the reason that all cars don't yet have roller lifters or the equivalent. They are significantly much more expensive than solid lifters, and more complex (so more stuff to design, to manufacture, to assemble, to engineer, to break), even though they have obvious advantages.
-soD
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