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

Those wound-up pieces of high-tensile steel under your rocker arms work so hard closing your valves over millions of cycles that they could probably use a replacement right about now. We're talking ...

A leaky heart valve may not cause any symptoms, or symptoms can come on gradually over time. Some of the most common symptoms of a leaky heart valve can also be caused by other conditions. Your heart ...