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 The hydraulic roller lifter (left) has a taller, heavier body than the solid roller lifter (right). In big-block Chevys, the taller, heavier hydraulic roller lifters often have valve float and power dropping off at higher rpm (over 6,100 rpm). That’s OK if you don’t want to spin your BBC at high rpm for longer engine life or periodically set the valve lash. With the lighter solid roller lifter (PN 866-16), there’s no valve float to drop off power at high rpm. Note: Comp now offers a new short travel hydraulic roller lifter to allow higher engine rpm for those who want a no-maintenance valvetrain.