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I'd love to see a hydraulic roller in a NASCAR engine
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OMG, that wouldn't last long. Probably not even a dyno run. IMO, I wouldn't run hydraulic lifters past 6000 for a very long time. The hydraulic roller lifters might stand that kind of RPM a little better than a flat tappet. I have pushed a hydraulic roller harder than a flat tappet motor and not had problems. Hydraulic lifters collapse at that RPM. That has been my experience.