The engines of yesteryear were pretty simple, with tappets clackity-clacking away on cam lobes, opening valves, and making a ruckus while doing it. Mechanical lifters were adequate for valve operation ...

Ticking noises from a car's engine are rarely welcome, but if your lifters are clicking away in the background, it's worth fixing it sooner, rather than later.

GM is finally fixing the reliability concerns of the Silverado and Sierra engines that have hurt owner confidence.