Before the implementation of hydraulic lifters to keep the engine's valves in proper working order, regular adjustment was required to maintain the critically necessary clearance in the valvetrain.

Why Valve Lash Matters During Engine Break-In. Learn why proper valve lash is critical during break-in and how incorrect adjustment can affect performance, reliability, and engine life. #ValveLash #En ...

Last month's "How It Works" story gave you the basics of the four-stroke cycle, describing the motion of the intake and exhaust valves in relation to the piston moving up and down in the cylinder.

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 ...