Not Ranked
Depends
What do you mean by rev?
6K?
7K?
8K?
9K?
What you need varies considerably depending on your intention and may touch everything from the oiling system to the valvetrain, rods, crank, bearings...you name it.
If you're talking purely valvetrain stability, Jomar makes girdles.
It would be better to outline your build and intention so I could speak more intelligently about what I'd do if it was mine.
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