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I can tell you that I've done an inadvertent 4-to-3 upshift in my SRF and gotten 7400rpm on an engine redlined at 6000, and it survived (although it pumped up the lifters and clattered for a moment. a couple of minutes later it was fine. Although when it was torn down a couple of months later, there was definite signs of damage...but then again, it was a 3+ year old engine.
The bad news is that a friend, on a newer motor, did the same thing and got 7300rpm and broke the engine.
In short, sometimes you get away with it, sometimes not. Compression and leakdown combined should give you a rough idea, although certainly you have to figure that engine might not survive another massive overrev.
Steve
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