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I turn a 4.5 stroke 8K with a set of 440-1's. I know a 4.15 stroke will go that too. The 4.5 stoke has way way more cycles per minute, which wears out parts though.
I know this to be true, despite what the text book racers may think.

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Bob, are you sure that what you wrote is what you meant? RPM are RPM regardless of stroke, 5000 RPM is 5000 RPM with two inch stroke or a four inch stroke The ring and piston travel, distance traveled, is more on a long stroke motor than a short stroke motor 5000 RPM on a two inch stroke motor equals 10,000 inches per minute, the four inch stroke motor rings will travel 20,000 inches in the same minute Not trying to start or make a war, just trying to make sure what we are discussing is accurate and understood the same by all readers