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I don't think it makes much sense to spin a non-variable cam timing engine to 8k rpm. What you can gain on the top end, you give up down low. For a street engine that's a bad compromise.
My turbo Audi engine (I built) with fixed cam timing spins to 8200 rpm. It starts making real power at 4k. I wouldn't consider it really streetable. It can get annoying, and draw a lot of attention, when you start shifting at 8k rpm while in traffic.
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