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.

COMP Cams helps us and shows us how to properly adjust hydraulic lifters with a performance camshaft.

The hydraulic roller lifters used by the fifth-gen 6.7 eliminated the need to adjust valve lash and reduced the engine noise level, but introduced a new failure point.

Both the hydraulic and solid flat tappet cams are limited in terms of longevity, as the sliding-contact design accelerates cam and lifter wear (especially compared to hydraulic roller combinations).

The hydraulic roller lifters used by the fifth-gen 6.7 eliminated the need to adjust valve lash and reduced the engine noise level, but introduced a new failure point.