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Originally Posted by Spooler
700ft/lb at 4550 RPM and mine were done. It appears the higher the RPM the peak TQ is, the lesser of a problem it is.
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There could be some correlation, but I would be surprised if its extremely significant. Perhaps there is some resonant frequency or something occurring somewhere in the upper range that is rocking the cylinders. I would say that torque output is a far less convoluted indication of cylinder pressures than horsepower (torque at higher RPM) or boost levels.
Just because yours failed at 700 doesnt mean it couldnt hold 800-900-1000, or could have failed eventually at 600. Dont forget the fatigue and wear factor. Just like we can run a stock engine at 800 for a while... it will eventually fail, but when it does, you might only be running 600 at that moment.