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 ...

Jacobs Vehicle System’s new Fulcrum Bridge for off-highway trucks will eliminate the need to periodically adjust engine lash – the mechanical clearance between the valve and camshaft. It will also ...

Dear Tom and Ray: I drive a 1995 Ford Probe with roughly 138,000 miles on it. According to my mechanic, the rattlelike noise I hear as I drive is the result of valve tap. My mechanic indicated that it ...

Time was when a valve job was done with some valve-grinding compound and a vacuum cup on a stick. But no more. Today's high performance engines require the same machining precision in the valves that ...

With so many of our discussions lately revolving around the valvetrain, we thought you might like to finally learn how to get the best performance from yours. High-performance valvetrains can take ...