| On OHC overhead cam engine the equivalent of a rocker arm. | |
| The lower half of the bearing the saddle. It is removable, as in main cap or rod cap. | |
| The burning of the air/fuel mixture. | |
| The eccentric on a camshaft that acts on lifters or followers in turn, other valvetrain components as the camshaft is rotated, to open the intake exhaust valves. |