I think the valvetrain is going to be the limiting factor. The pistons and rods are really stout they should be able to handle 8,000 plus rpm without any problems. But the VVEL is really sophisticated and has a lot of moving party. If you damage it you have to replace the whole head there are no replacement parts available and I'm guessing it's pricey. I think 8,000 rpm is a good limit I wouldn't push it past that for fear of damaging the valvetrain.
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