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it's all a nice exercise... Have titanium valves, retainers, spring keepers? Well then lighten that reciprocating end and run a lighter spring, you might be good to 24,000 rpms! stock nissan rockers on our bonneville engine were stable to 13,000 rpms in our testing. I think valve, spring, and cam profile selection play a much more critical role. If you note the E-Motive guys polished theirs similar to TimZ. We didn't even do that, though I have in the past on other engines (Yamaha....)