A small gap with big importance in the performance and health of an engine - here's everything you need to know.

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 ...

One of the biggest hassles with a solid (mechanical tappet) cam is the need to regularly readjust valve lash, a task usually associated with an aggravating hot oil bath. The best method of setting ...