On engines equipped with hydraulic tappets, zero lash at maximum tappet plunger rise can be determined by rotating the pushrod with your fingertips while slowly turning the lash adjusting nut. The ...

The flat tappet advantage is less mass and weight compared to a roller tappet. Although it is easy to assume the flat tappet rides the cam lobe dead center. Nothing could be further from the truth.

How to improve Top-End RPM by adjusting hydraulic lifters for proper preload by Turning the rocker arm adjustment nut a lesser amount after reaching the zero-lash point.