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13b. Now in the overall scheme of hydraulic roller spring pressures, this isn’t overly high, but I would consider it a moderate spring package for a street hydraulic roller. I don’t want any chance of valve float, and even at 6,200 rpm, there were no signs of any.” The valves are 5000-series Ferreas, 3/8-inch diameter. The sizes are 2.065-inch intake and 1.720-inch exhaust.