Roller rocker

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A roller rocker is a rocker assembly that uses bearings instead of metal sliding on metal.

A cam/rocker assembly uses a normal cam, but the rocker has a wheel on the end of it like that of a measuring wheel, which rolls by the use of needle roller bearings.

The amount of power required to spin a cam is surprisingly high, and it gets harder if stiffer valve springs are used, which are necessary to prevent valve bounce with aggressive cam profiles at high rpm.