Over-rev?
#21
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I'd say with the rod bolts swapped out with the katech you should be good @ 6500 RPM. You definitely won't be breaking any rod bolts at 260,000 psi tensile strength. I have a set that I never used (I ended up just using the rod bolts that came with the eagle rods that are good for 190,000 psi tensile strength). If you're interested send me a PM.