High rpms are good for hp numbers given that everything else supports it. Without electronic cam phasing though, adj runners, fuel injection, any high-revving car will be a pig below a realistic 3500 as it wasn't designed to operate in that low-range.
I know of an SN95 with a 306 that runs 9's on nuts, but I won't dare say he shifts below 7700 Rpms and has invested close to 15000 with parts and numberous dyno runs, part swaps and so-forth. 15G just in the mill.
Because horsepower is a function of torque and rotational speed, I'm guessing these cars don't have a lot of torque but make up for it by screaming high RPM, that's why I said that. I'm assuming they have the components to support running at that RPM, including gearing to make it feasible on the street.
Hell, Indy cars make twice that much horsepower with just a liter more (3.5L for those not savvy) , but they rev limit at 10300 RPM. Any size engine can make crazy HP numbers providing you can flow enough air and fuel at the speed you need to spin the crank.
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