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I haven't seen any reports of that high an rpm range with a hydraulic yet. Keith mentioned he is working on some he expects to run 6200 or so. Thats about as high as I've heard of. At any rate, my solid flat tappet is mostly done at 6200 anyway, which is high enough for me! It gets pretty expensive pushing that rpm limit much higher than 6500 (crank, rods, pistons, valves, heads, etc.).
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